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.

A283566 Number of n X n 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element.

Table of values

n a(n)
1 0
2 4
3 169
4 6812
5 945100
6 226897932
7 129997769458
8 172466774677716
9 522509795096193625
10 3748613500011644923440
11 62982260120608888164984371

List of values

[0, 4, 169, 6812, 945100, 226897932, 129997769458, 172466774677716, 522509795096193625, 3748613500011644923440, 62982260120608888164984371]

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

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