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 1-10 of 11 results. Next

A240148 Number of nX2 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

3, 5, 11, 25, 62, 144, 329, 775, 1781, 4150, 9625, 22243, 51656, 119768, 277454, 643440, 1492066, 3458520, 8019402, 18594916, 43110992, 99960080, 231775985, 537393625, 1246028348, 2889126804, 6698837457, 15532273640, 36014074118
Offset: 1

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Author

R. H. Hardin, Apr 02 2014

Keywords

Comments

Column 2 of A240153

Examples

			Some solutions for n=4
..3..3....3..3....3..2....3..2....2..2....3..3....3..3....3..3....2..2....2..2
..2..2....2..1....3..2....3..1....0..2....2..1....2..1....2..1....0..2....0..2
..3..1....0..2....0..3....2..2....0..3....3..2....3..2....3..2....0..3....0..2
..2..1....3..2....0..3....3..1....2..2....0..2....3..2....3..1....0..3....0..2
		

Formula

Empirical: a(n) = 3*a(n-2) +14*a(n-3) +5*a(n-4) -28*a(n-5) -89*a(n-6) -50*a(n-7) +93*a(n-8) +303*a(n-9) +214*a(n-10) -113*a(n-11) -561*a(n-12) -468*a(n-13) -47*a(n-14) +584*a(n-15) +499*a(n-16) +142*a(n-17) -359*a(n-18) -96*a(n-19) -23*a(n-20) +128*a(n-21) -102*a(n-22) -99*a(n-23) -119*a(n-24) +32*a(n-25) +82*a(n-26) +113*a(n-27) +50*a(n-28) -7*a(n-29) -42*a(n-30) -20*a(n-31) +a(n-32) +4*a(n-33) +a(n-34) for n>36

A240149 Number of nX3 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

4, 8, 20, 67, 254, 825, 2667, 8652, 27929, 91436, 297311, 965014, 3135633, 10174603, 33030794, 107154304, 347714014, 1127972498, 3659419980, 11870924983, 38508782933, 124917347816, 405214920992, 1314447547691, 4263837727610
Offset: 1

Views

Author

R. H. Hardin, Apr 02 2014

Keywords

Comments

Column 3 of A240153

Examples

			Some solutions for n=4
..3..3..2....3..3..2....2..2..3....2..2..3....3..2..3....3..2..3....2..2..3
..2..1..2....2..1..1....0..2..2....0..2..1....3..2..1....3..1..2....0..2..1
..0..0..3....0..0..3....0..3..3....2..0..2....2..2..3....2..1..3....2..2..2
..0..2..1....0..2..2....2..2..3....0..0..2....2..0..1....2..0..2....2..1..1
		

A240150 Number of nX4 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

7, 19, 107, 676, 3993, 22412, 131005, 731518, 4144347, 23263202, 131973267, 742448151, 4200516883, 23673251649, 133792056873, 754644250144, 4262766555182, 24053911144152, 135834058269434, 766651910127519
Offset: 1

Views

Author

R. H. Hardin, Apr 02 2014

Keywords

Comments

Column 4 of A240153

Examples

			Some solutions for n=4
..3..2..3..3....3..2..3..2....3..3..2..3....2..2..3..2....2..2..3..2
..3..2..1..1....3..2..1..1....2..1..2..1....0..2..1..2....0..2..1..1
..2..2..3..2....2..2..0..2....0..0..3..3....2..2..0..3....0..2..2..3
..3..2..1..2....2..0..0..1....0..3..2..3....2..0..2..2....0..2..2..2
		

A240154 Number of 2Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

3, 5, 8, 19, 36, 57, 120, 218, 377, 758, 1366, 2451, 4815, 8678, 15839, 30594, 55356, 102004, 194522, 353711, 655297, 1238182, 2261878, 4202427, 7889648, 14469040, 26917836, 50315864, 92567160, 172279431, 321102231, 592194036, 1102055156
Offset: 1

Views

Author

R. H. Hardin, Apr 02 2014

Keywords

Comments

Row 2 of A240153

Examples

			Some solutions for n=4
..3..2..3..2....2..2..3..3....3..2..3..3....2..2..3..3....2..2..3..2
..3..2..1..1....0..0..2..1....3..1..2..2....0..2..1..1....0..2..1..1
		

Formula

Empirical: a(n) = a(n-2) +8*a(n-3) -5*a(n-5) -18*a(n-6) +a(n-7) +10*a(n-8) +16*a(n-9) -5*a(n-10) -10*a(n-11) +a(n-12) +6*a(n-13) -2*a(n-14) -6*a(n-15) -a(n-16) +6*a(n-17) for n>19

A240155 Number of 3Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

4, 11, 20, 107, 186, 450, 1641, 2788, 8018, 23175, 45126, 134673, 357608, 737260, 2166386, 5505921, 11966760, 34560626, 85121623, 194751022, 548083132, 1325791556, 3156785846, 8660504920, 20790818391, 50929828270, 136560783094
Offset: 1

Views

Author

R. H. Hardin, Apr 02 2014

Keywords

Comments

Row 3 of A240153

Examples

			Some solutions for n=4
..2..2..3..2....2..2..3..3....3..3..2..3....2..2..3..2....3..2..3..3
..0..2..1..1....0..2..1..1....2..1..2..1....0..2..1..1....3..2..1..2
..0..0..3..3....2..2..3..2....0..0..3..3....0..0..0..3....2..2..3..3
		

A240156 Number of 4Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

7, 25, 67, 676, 1328, 5701, 24419, 52676, 243555, 876504, 2400051, 10681824, 37465330, 108284648, 460964686, 1527396439, 4792821890, 19591078862, 63187977557, 212419410767, 830175708307, 2671224202187, 9338356637595
Offset: 1

Views

Author

R. H. Hardin, Apr 02 2014

Keywords

Comments

Row 4 of A240153

Examples

			Some solutions for n=4
..2..2..3..3....2..2..3..2....2..2..3..3....2..2..3..2....2..2..3..2
..0..0..2..2....0..2..1..2....0..2..1..3....0..2..1..1....0..2..1..1
..0..2..1..3....0..0..0..3....2..2..2..1....0..0..2..1....0..0..3..3
..0..2..0..2....0..0..0..2....0..2..0..1....2..0..0..2....0..2..2..2
		

A240157 Number of 5Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

10, 62, 254, 3993, 11742, 88214, 536744, 1652584, 11331387, 57296488, 223202826, 1550772274, 7551863892, 32607176000, 200353447144, 939471999117, 4301332018225, 25319460629707, 117174747947500, 578341876385557
Offset: 1

Views

Author

R. H. Hardin, Apr 02 2014

Keywords

Comments

Row 5 of A240153

Examples

			Some solutions for n=4
..2..2..3..2....2..2..3..3....2..2..3..2....2..2..3..2....2..2..3..3
..0..2..1..2....0..0..2..1....0..2..1..2....0..2..1..2....0..2..1..2
..0..0..3..2....2..0..0..2....0..0..0..3....2..2..3..3....2..2..3..1
..2..2..3..1....2..2..3..2....2..0..2..3....0..2..2..3....0..0..2..2
..0..2..2..2....0..2..0..2....0..2..0..2....2..2..0..2....2..2..0..3
		

A240147 Number of n X n 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

2, 5, 20, 676, 11742, 1608415, 417799464
Offset: 1

Views

Author

R. H. Hardin, Apr 02 2014

Keywords

Comments

Diagonal of A240153

Examples

			Some solutions for n=4
..2..2..3..2....2..2..3..2....2..2..3..2....2..2..3..2....3..2..3..3
..0..2..1..1....0..2..1..1....0..2..1..1....0..2..1..1....3..1..2..2
..2..2..2..2....2..0..2..3....2..0..0..1....2..2..3..3....2..2..0..3
..3..2..0..1....0..0..0..2....2..2..3..3....0..2..1..1....2..0..0..2
		

A240151 Number of nX5 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

10, 36, 186, 1328, 11742, 108201, 1056699, 10526838, 107361960, 1116331018, 11525618748, 120250941392, 1248359598803, 13042277879115, 135683637852581, 1417567382471017, 14760989837426228
Offset: 1

Views

Author

R. H. Hardin, Apr 02 2014

Keywords

Comments

Column 5 of A240153

Examples

			Some solutions for n=4
..2..2..3..3..2....3..2..3..2..2....2..2..3..3..2....3..2..3..3..3
..0..0..2..1..1....3..2..1..1..2....0..2..2..3..1....3..2..1..2..2
..2..2..0..3..3....2..2..0..3..3....2..0..0..0..2....2..2..3..3..1
..2..0..1..2..1....3..1..0..0..2....0..0..0..0..3....3..1..3..3..2
		

A240152 Number of nX6 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

15, 57, 450, 5701, 88214, 1608415, 30542203, 584983851, 11643589675, 228028231216
Offset: 1

Views

Author

R. H. Hardin, Apr 02 2014

Keywords

Comments

Column 6 of A240153

Examples

			Some solutions for n=3
..2..2..3..3..2..2....3..3..2..3..2..3....2..2..3..2..3..2....2..2..3..2..3..3
..0..2..1..3..1..2....2..1..2..1..2..2....0..2..1..2..1..1....0..2..1..1..2..1
..0..2..2..2..1..3....0..0..0..3..3..1....2..2..2..2..3..2....2..2..3..2..3..2
		
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