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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.

A211909 Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal or vertical neighbor, and containing the value n(n+1)/2-6.

Table of values

n a(n)
1 0
2 0
3 42
4 11296
5 3997836
6 350026718
7 12075054829
8 228741733963

List of values

[0, 0, 42, 11296, 3997836, 350026718, 12075054829, 228741733963]

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

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