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

A240041 Number of nX2 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

2, 4, 10, 22, 50, 119, 276, 637, 1473, 3355, 7682, 17497, 39777, 90406, 205111, 465359, 1054871, 2390302, 5415591, 12265608, 27777095, 62895884, 142401878, 322392952, 729835421, 1652150714, 3739914222, 8465684665, 19162662378, 43375394510
Offset: 1

Views

Author

R. H. Hardin, Mar 31 2014

Keywords

Comments

Column 2 of A240046

Examples

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

Formula

Empirical: a(n) = 3*a(n-2) +10*a(n-3) +3*a(n-4) -12*a(n-5) -46*a(n-6) -36*a(n-7) +12*a(n-8) +107*a(n-9) +87*a(n-10) +2*a(n-11) -145*a(n-12) -138*a(n-13) -48*a(n-14) +147*a(n-15) +185*a(n-16) +89*a(n-17) -94*a(n-18) -210*a(n-19) -111*a(n-20) +40*a(n-21) +176*a(n-22) +85*a(n-23) +30*a(n-24) -77*a(n-25) -47*a(n-26) -57*a(n-27) +14*a(n-29) +21*a(n-30) +14*a(n-31) -3*a(n-32) +2*a(n-33) -5*a(n-34) +a(n-35) +2*a(n-36) +a(n-37) -a(n-38) for n>40

A240042 Number of nX3 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

4, 9, 26, 93, 309, 1043, 3597, 12865, 45491, 163686, 584594, 2103512, 7548847, 27174662, 97768996, 352008043, 1267200666, 4563053012, 16431815183, 59173883901, 213095423135, 767419010967, 2763770574117, 9953309109574
Offset: 1

Views

Author

R. H. Hardin, Mar 31 2014

Keywords

Comments

Column 3 of A240046

Examples

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

A240043 Number of nX4 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

6, 20, 72, 346, 1496, 8567, 46381, 268672, 1556758, 9438166, 56174788, 346760638, 2098659043, 13032771483, 79558734990, 494814764391, 3034462087200, 18868201942704, 116012171614159, 720835003158134, 4439604572498702
Offset: 1

Views

Author

R. H. Hardin, Mar 31 2014

Keywords

Comments

Column 4 of A240046

Examples

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

A240047 Number of 2Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

2, 4, 9, 20, 33, 76, 117, 232, 398, 675, 1228, 2002, 3548, 5935, 10128, 17287, 28967, 49649, 83130, 141412, 238567, 402406, 681948, 1147552, 1943230, 3275448, 5532679, 9343794, 15759620, 26629572, 44915334, 75854561, 128021118, 216075045
Offset: 1

Views

Author

R. H. Hardin, Mar 31 2014

Keywords

Comments

Row 2 of A240046

Examples

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

Formula

Empirical: a(n) = 3*a(n-2) +4*a(n-3) -3*a(n-4) -7*a(n-5) -5*a(n-6) +6*a(n-7) +4*a(n-8) +a(n-9) -3*a(n-10) +2*a(n-11) -a(n-12) -2*a(n-14) +4*a(n-15) -2*a(n-18) for n>22

A240048 Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

4, 10, 26, 72, 174, 597, 1187, 3115, 7269, 16520, 39181, 89951, 210684, 483773, 1131924, 2616441, 6047969, 14112456, 32543109, 75591535, 175328537, 405822918, 941534652, 2181820138, 5057085795, 11720944941, 27171466826, 62973901722
Offset: 1

Views

Author

R. H. Hardin, Mar 31 2014

Keywords

Comments

Row 3 of A240046

Examples

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

Formula

Empirical recurrence of order 76 (see link above)

A240049 Number of 4Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

6, 22, 93, 346, 1110, 5780, 17297, 57800, 202995, 643326, 2233216, 7442776, 25047361, 84213282, 278643460, 939079721, 3094143301, 10358660848, 34579518631, 114236046070, 383085583978, 1270523789559, 4220562761492
Offset: 1

Views

Author

R. H. Hardin, Mar 31 2014

Keywords

Comments

Row 4 of A240046

Examples

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

A240050 Number of 5 X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

8, 50, 309, 1496, 7514, 55034, 236282, 1248277, 6431987, 29170979, 155931126, 801190472, 4068998418, 19619747500, 103973075128, 508889855031, 2476317886402, 12705627199443, 63280997191424, 313215400063102
Offset: 1

Views

Author

R. H. Hardin, Mar 31 2014

Keywords

Comments

Row 5 of A240046.

Examples

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

Crossrefs

Cf. A240046.

A240040 Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

2, 4, 26, 346, 7514, 640643, 104619164, 49892724623
Offset: 1

Views

Author

R. H. Hardin, Mar 31 2014

Keywords

Comments

Diagonal of A240046

Examples

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

A240044 Number of nX5 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

8, 33, 174, 1110, 7514, 61858, 515675, 4743056, 45158204, 453408919, 4712861517, 51120946600, 562235041667, 6362903006738, 71977060151899, 829848814960705, 9503133899373343, 110368341821576074
Offset: 1

Views

Author

R. H. Hardin, Mar 31 2014

Keywords

Comments

Column 5 of A240046

Examples

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

A240045 Number of n X 6 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

Original entry on oeis.org

14, 76, 597, 5780, 55034, 640643, 8300260, 119956268, 1944727891, 34311716212, 646898229040
Offset: 1

Views

Author

R. H. Hardin, Mar 31 2014

Keywords

Examples

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

Crossrefs

Column 6 of A240046.
Showing 1-10 of 11 results. Next