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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.

A241304 Number of nX5 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Table of values

n a(n)
1 8
2 40
3 186
4 1462
5 6718
6 41336
7 217785
8 1215485
9 6526016
10 35833494
11 193952033
12 1061500415
13 5762495209
14 31479526822
15 171241179058
16 934265732146
17 5087340052649
18 27739343474292
19 151117812704114
20 823771403533550

List of values

[8, 40, 186, 1462, 6718, 41336, 217785, 1215485, 6526016, 35833494, 193952033, 1061500415, 5762495209, 31479526822, 171241179058, 934265732146, 5087340052649, 27739343474292, 151117812704114, 823771403533550]

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

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