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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.

A195247 Number of lower triangles of an n X n 0..7 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 8
2 122
3 5870
4 886084
5 421064386
6 631149414120
7 2987571816007840
8 44691981426014450274
9 2113939963847059814381026
10 316271939439306387096992492956
11 149706956331711946010383809151524932

List of values

[8, 122, 5870, 886084, 421064386, 631149414120, 2987571816007840, 44691981426014450274, 2113939963847059814381026, 316271939439306387096992492956, 149706956331711946010383809151524932]

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

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