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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.

A240409 Number of nX4 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, modulo 4.

Table of values

n a(n)
1 6
2 80
3 846
4 11670
5 148536
6 2051450
7 27295809
8 377924479
9 5090700587
10 70407569019
11 954551839061
12 13174232753505
13 179288052424091
14 2469879998025684
15 33692295233425277
16 463482286724987999
17 6332258123206034509

List of values

[6, 80, 846, 11670, 148536, 2051450, 27295809, 377924479, 5090700587, 70407569019, 954551839061, 13174232753505, 179288052424091, 2469879998025684, 33692295233425277, 463482286724987999, 6332258123206034509]

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

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