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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.

A195216 Number of lower triangles of an n X n integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by 4 or less and triangles differing by a constant counted only once.

Table of values

n a(n)
1 1
2 61
3 18903
4 31640829
5 289301569283
6 14572563308953245
7 4059527861103273129317
8 6270118871204192400242141667
9 53785756580019628016324622812810239

List of values

[1, 61, 18903, 31640829, 289301569283, 14572563308953245, 4059527861103273129317, 6270118871204192400242141667, 53785756580019628016324622812810239]

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

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