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.

A240887 Number of n X n 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order.

Table of values

n a(n)
1 1
2 4
3 57
4 2362
5 245268
6 64074526
7 41971040844
8 69012323813116
9 284711573170326892

List of values

[1, 4, 57, 2362, 245268, 64074526, 41971040844, 69012323813116, 284711573170326892]

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

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