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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.

A211908 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)/2-5.

Table of values

n a(n)
1 0
2 0
3 42
4 6927
5 605769
6 18239150
7 281228042
8 2788818593
9 20221781939

List of values

[0, 0, 42, 6927, 605769, 18239150, 281228042, 2788818593, 20221781939]

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

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