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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.

A239398 Number of n X n 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4.

Table of values

n a(n)
1 2
2 23
3 1337
4 394509
5 614216271
6 5072216819342
7 217822754771248124
8 49235710631611399112515
9 58260708510317695923927600575

List of values

[2, 23, 1337, 394509, 614216271, 5072216819342, 217822754771248124, 49235710631611399112515, 58260708510317695923927600575]

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

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