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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.

A239983 Number of nX5 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 6
3 38
4 530
5 7113
6 83658
7 1174822
8 15307425
9 192702130
10 2733573580
11 34877309132
12 455831231370
13 6232060203371
14 79504957220188
15 1061047782962716
16 14175980247721974
17 182879377335377352
18 2451126765466429888

List of values

[1, 6, 38, 530, 7113, 83658, 1174822, 15307425, 192702130, 2733573580, 34877309132, 455831231370, 6232060203371, 79504957220188, 1061047782962716, 14175980247721974, 182879377335377352, 2451126765466429888]

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

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