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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.

A212042 Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any element within a city block distance of two, and containing the value n(n+1)/2-5.

Table of values

n a(n)
1 0
2 0
3 5
4 447
5 94131
6 5054845
7 109065807
8 1339229741
9 11235618109

List of values

[0, 0, 5, 447, 94131, 5054845, 109065807, 1339229741, 11235618109]

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

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