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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.

A195243 Number of lower triangles of an n X n 0..3 array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less.

Table of values

n a(n)
1 4
2 46
3 1682
4 190514
5 67379894
6 74236765958
7 254948725307650
8 2728873272983950594
9 91038149737139587502854
10 9466106148769015848820814134
11 3067809430979519600024270636572850

List of values

[4, 46, 1682, 190514, 67379894, 74236765958, 254948725307650, 2728873272983950594, 91038149737139587502854, 9466106148769015848820814134, 3067809430979519600024270636572850]

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

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