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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.

A239997 Number of nX4 0..3 arrays with no element equal to one 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 5
2 42
3 526
4 6527
5 86360
6 1225281
7 18392485
8 290513038
9 4767970186
10 80410934960
11 1381071762609
12 24002339457710
13 420292066661594
14 7394152265405038
15 130463578696387397
16 2306049013760669647
17 40806118077181581732

List of values

[5, 42, 526, 6527, 86360, 1225281, 18392485, 290513038, 4767970186, 80410934960, 1381071762609, 24002339457710, 420292066661594, 7394152265405038, 130463578696387397, 2306049013760669647, 40806118077181581732]

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

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