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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.

A239982 Number of nX4 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

n a(n)
1 1
2 5
3 22
4 171
5 1391
6 9079
7 70107
8 514297
9 3533132
10 27478686
11 195617485
12 1396299371
13 10574699363
14 74869696354
15 547239827048
16 4060652644276
17 28932235350938
18 213204213265435
19 1560042805514282
20 11221251973358733
21 82689323867874597

List of values

[1, 5, 22, 171, 1391, 9079, 70107, 514297, 3533132, 27478686, 195617485, 1396299371, 10574699363, 74869696354, 547239827048, 4060652644276, 28932235350938, 213204213265435, 1560042805514282, 11221251973358733, 82689323867874597]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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