cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-9 of 9 results.

A230757 T(n,k)=Number of (n+3)X(k+3) 0..2 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

Original entry on oeis.org

12, 192, 192, 2700, 5544, 2700, 31212, 178608, 178608, 31212, 363312, 4838400, 13305708, 4838400, 363312, 4120752, 129731328, 820317888, 820317888, 129731328, 4120752, 46949808, 3423037464, 51048476748, 116879941620, 51048476748
Offset: 1

Views

Author

R. H. Hardin, Oct 29 2013

Keywords

Comments

Table starts
.......12.........192............2700..............31212................363312
......192........5544..........178608............4838400.............129731328
.....2700......178608........13305708..........820317888...........51048476748
....31212.....4838400.......820317888.......116879941620........17027460691212
...363312...129731328.....51048476748.....17027460691212......5769362600920812
..4120752..3423037464...3154520054700...2446111719135732...1928867953682733132
.46949808.90231813552.194576103540300.350956390609736652.645610139671314494208

Examples

			Some solutions for n=1 k=4
..0..0..2..2..0..0..0....0..2..0..0..1..1..2....0..1..0..2..1..0..2
..1..1..0..0..1..1..2....0..1..2..2..1..0..2....2..1..0..2..1..0..2
..0..2..0..1..1..0..2....0..1..2..2..1..0..2....0..0..2..2..1..0..2
..1..2..0..2..2..0..2....0..2..0..0..1..0..2....2..2..1..0..2..0..2
		

Formula

Empirical for column k:
k=1: [order 15]
k=2: [order 36]
T(n,k)=3*A230708(n,k)*A230739(n,k)

A230701 Number of (n+3) X (1+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

Original entry on oeis.org

2, 8, 30, 102, 348, 1172, 3956, 13326, 44916, 151338, 509978, 1718408, 5790456, 19511640, 65747178, 221543696, 746521190, 2515502046, 8476319172, 28562083692, 96243740012, 324306077270, 1092792451740, 3682309466130, 12408031373682
Offset: 1

Views

Author

R. H. Hardin, Oct 28 2013

Keywords

Comments

Column 1 of A230708.

Examples

			Some solutions for n=2:
..0..x..0..x....0..x..1..x....0..x..0..x....0..x..0..x....0..x..2..x
..x..1..x..1....x..1..x..2....x..1..x..2....x..1..x..2....x..1..x..0
..0..x..2..x....2..x..0..x....2..x..0..x....2..x..1..x....0..x..1..x
..x..2..x..0....x..0..x..2....x..0..x..2....x..0..x..0....x..2..x..0
..1..x..1..x....2..x..1..x....2..x..1..x....2..x..2..x....1..x..2..x
		

Crossrefs

Cf. A230708.

Formula

Empirical: a(n) = 3*a(n-1) + 3*a(n-2) - 6*a(n-3) + a(n-5).
Empirical g.f.: 2*x*(1 + x) / ((1 - x)*(1 - 2*x - 5*x^2 + x^3 + x^4)). - Colin Barker, Mar 17 2018

A230703 Number of (n+3) X (3+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

Original entry on oeis.org

30, 244, 2106, 16536, 130446, 1025430, 8053490, 63237238, 496590056, 3899177780, 30617038898, 240407287782, 1887698838680, 14822368917190, 116386479715646, 913876264039036, 7175832414626878, 56345230976142602, 442427428831168274
Offset: 1

Views

Author

R. H. Hardin, Oct 28 2013

Keywords

Comments

Column 3 of A230708.

Examples

			Some solutions for n=2
..0..x..0..x..0..x....0..x..2..x..2..x....0..x..0..x..1..x....0..x..0..x..2..x
..x..1..x..1..x..2....x..1..x..0..x..2....x..1..x..2..x..0....x..1..x..0..x..1
..0..x..2..x..1..x....0..x..1..x..0..x....0..x..2..x..1..x....2..x..0..x..1..x
..x..1..x..0..x..1....x..2..x..0..x..1....x..1..x..0..x..1....x..0..x..2..x..0
..0..x..0..x..2..x....1..x..2..x..2..x....0..x..0..x..2..x....2..x..1..x..2..x
		

Crossrefs

Cf. A230708.

Formula

Empirical: a(n) = 6*a(n-1) +27*a(n-2) -64*a(n-3) -295*a(n-4) -13*a(n-5) +1890*a(n-6) +812*a(n-7) -4466*a(n-8) -467*a(n-9) -3948*a(n-10) +16934*a(n-11) -22529*a(n-12) +17109*a(n-13) -1911*a(n-14) -6225*a(n-15) +731*a(n-16) +3024*a(n-17) -978*a(n-18) -86*a(n-19) +436*a(n-20) -24*a(n-21) -30*a(n-22).

A230705 Number of (n+3)X(5+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

Original entry on oeis.org

348, 6576, 130446, 2382398, 43853402, 801845362, 14669811856, 268320990890, 4907081716780, 89741960163156, 1641217724600070, 30014492191668694, 548906193959555044, 10038390389027140378, 183582034355172126804
Offset: 1

Views

Author

R. H. Hardin, Oct 28 2013

Keywords

Comments

Column 5 of A230708

Examples

			Some solutions for n=2
..0..x..2..x..2..x..2..x....0..x..0..x..0..x..1..x....0..x..2..x..2..x..0..x
..x..1..x..0..x..0..x..1....x..1..x..1..x..2..x..0....x..1..x..0..x..1..x..0
..0..x..0..x..1..x..0..x....0..x..2..x..0..x..2..x....0..x..2..x..1..x..1..x
..x..2..x..0..x..2..x..2....x..2..x..0..x..2..x..1....x..2..x..1..x..2..x..0
..1..x..1..x..2..x..1..x....1..x..1..x..1..x..0..x....1..x..0..x..0..x..2..x
		

A230707 Number of (n+3)X(7+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

Original entry on oeis.org

3956, 173428, 8053490, 342031378, 14669811856, 625553036008, 26681634560690, 1137681116923966, 48508501856178526, 2068224674692996586, 88181384650502245634, 3759701430154725238638, 160298702553771350622996
Offset: 1

Views

Author

R. H. Hardin, Oct 28 2013

Keywords

Comments

Column 7 of A230708

Examples

			Some solutions for n=2
..0..x..0..x..2..x..1..x..1..x....0..x..1..x..1..x..2..x..1..x
..x..1..x..1..x..0..x..2..x..0....x..1..x..2..x..2..x..0..x..2
..0..x..2..x..2..x..0..x..2..x....2..x..1..x..0..x..1..x..0..x
..x..2..x..0..x..1..x..2..x..1....x..0..x..1..x..2..x..0..x..1
..1..x..1..x..0..x..0..x..0..x....2..x..2..x..1..x..1..x..2..x
		

A230702 Number of (n+3)X(2+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

Original entry on oeis.org

8, 28, 244, 800, 6576, 21076, 173428, 554040, 4558536, 14555468, 119758148, 382358832, 3145930352, 10044068932, 82639468964, 263844008200, 2170826159272, 6930820136252, 57024624645332, 182063126310336, 1497958570841456
Offset: 1

Views

Author

R. H. Hardin, Oct 28 2013

Keywords

Comments

Column 2 of A230708

Examples

			Some solutions for n=2
..0..x..0..x..2....0..x..2..x..2....0..x..0..x..0....0..x..2..x..2
..x..1..x..0..x....x..1..x..0..x....x..1..x..1..x....x..1..x..0..x
..0..x..2..x..1....0..x..1..x..2....0..x..2..x..0....1..x..0..x..1
..x..1..x..2..x....x..2..x..1..x....x..2..x..0..x....x..2..x..2..x
..0..x..0..x..1....1..x..0..x..0....1..x..1..x..2....1..x..1..x..1
		

Formula

Empirical: a(n) = 31*a(n-2) -126*a(n-4) +42*a(n-6) +79*a(n-8) -a(n-10) +8*a(n-12)

A230704 Number of (n+3)X(4+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

Original entry on oeis.org

102, 800, 16536, 121382, 2382398, 17497342, 342031378, 2508344646, 49068380730, 359731738744, 7037607186036, 51594009748934, 1009342929539188, 7399695276172512, 144761390761971996, 1061274191458549174
Offset: 1

Views

Author

R. H. Hardin, Oct 28 2013

Keywords

Comments

Column 4 of A230708

Examples

			Some solutions for n=2
..0..x..0..x..2..x..0....0..x..2..x..0..x..0....0..x..0..x..1..x..1
..x..1..x..0..x..1..x....x..1..x..0..x..1..x....x..1..x..1..x..2..x
..2..x..1..x..2..x..0....0..x..0..x..1..x..2....0..x..2..x..0..x..1
..x..0..x..2..x..1..x....x..0..x..2..x..0..x....x..2..x..0..x..2..x
..2..x..1..x..0..x..0....2..x..1..x..1..x..2....1..x..1..x..1..x..1
		

Formula

Empirical: a(n) = 185*a(n-2) -6851*a(n-4) +145707*a(n-6) -2849231*a(n-8) +30720183*a(n-10) -36007996*a(n-12) -743385180*a(n-14) +287330815*a(n-16) +8627923017*a(n-18) -12118273932*a(n-20) -29408445279*a(n-22) +45675171837*a(n-24) -13807146112*a(n-26) -2411662568755*a(n-28) +3802259458200*a(n-30) +3456476952882*a(n-32) +4249525502473*a(n-34) -5769431443156*a(n-36) -7037014662528*a(n-38) +2632063276930*a(n-40) +18416679443602*a(n-42) +9430615399362*a(n-44) +259673859628*a(n-46) +64576080600*a(n-48) +325261872*a(n-50)

A230706 Number of (n+3)X(6+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

Original entry on oeis.org

1172, 21076, 1025430, 17497342, 801845362, 13663471254, 625553036008, 10652997961328, 487784854592488, 8305829325372360, 380324726478587580, 6475874805604555424, 296532282288946047888, 5049115344840115896488
Offset: 1

Views

Author

R. H. Hardin, Oct 28 2013

Keywords

Comments

Column 6 of A230708

Examples

			Some solutions for n=2
..0..x..0..x..0..x..1..x..1....0..x..0..x..1..x..1..x..2
..x..1..x..1..x..2..x..2..x....x..1..x..2..x..2..x..0..x
..0..x..2..x..1..x..0..x..1....2..x..1..x..0..x..2..x..1
..x..1..x..0..x..0..x..1..x....x..0..x..2..x..1..x..2..x
..0..x..2..x..2..x..2..x..0....2..x..2..x..0..x..0..x..1
		

A230700 Number of (n+3)X(n+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

Original entry on oeis.org

2, 28, 2106, 121382, 43853402, 13663471254, 26681634560690, 45145901233869558, 479398570293769095556, 4408105907275837627631446
Offset: 1

Views

Author

R. H. Hardin, Oct 28 2013

Keywords

Comments

Diagonal of A230708

Examples

			Some solutions for n=2
..0..x..2..x..2....0..x..0..x..1....0..x..2..x..2....0..x..0..x..1
..x..1..x..0..x....x..1..x..2..x....x..1..x..0..x....x..1..x..2..x
..0..x..2..x..1....2..x..1..x..0....0..x..1..x..2....0..x..2..x..1
..x..1..x..2..x....x..0..x..1..x....x..2..x..0..x....x..2..x..0..x
..0..x..0..x..1....2..x..2..x..0....1..x..1..x..2....1..x..1..x..2
		
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