cp's OEIS Frontend

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.

A211907 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)/2-4.

Table of values

n a(n)
1 0
2 0
3 41
4 2385
5 55822
6 637721
7 4639742
8 24871596
9 106911695
10 388681117
11 1238600816
12 3548005682
13 9306274551

List of values

[0, 0, 41, 2385, 55822, 637721, 4639742, 24871596, 106911695, 388681117, 1238600816, 3548005682, 9306274551]

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

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