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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.

A240147 Number of n X n 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one 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 2
2 5
3 20
4 676
5 11742
6 1608415
7 417799464

List of values

[2, 5, 20, 676, 11742, 1608415, 417799464]

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

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