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.

A283575 Number of 4Xn 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 68
3 1108
4 6812
5 67892
6 509952
7 3890056
8 29428836
9 214600036
10 1561753984
11 11203805186
12 79697223948
13 563151495500
14 3952776211644
15 27603742610922
16 191869394908352
17 1328251534591608
18 9162408587486912
19 63001467075539154

List of values

[0, 68, 1108, 6812, 67892, 509952, 3890056, 29428836, 214600036, 1561753984, 11203805186, 79697223948, 563151495500, 3952776211644, 27603742610922, 191869394908352, 1328251534591608, 9162408587486912, 63001467075539154]

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

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