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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.

A239811 Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it, modulo 4.

Table of values

n a(n)
1 2
2 23
3 1480
4 510748
5 884977259
6 8243207656791
7 399696014140196630
8 102140919909434198721245
9 136329092264192919129397551406

List of values

[2, 23, 1480, 510748, 884977259, 8243207656791, 399696014140196630, 102140919909434198721245, 136329092264192919129397551406]

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

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