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.

A283567 Number of nX3 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 1
2 26
3 169
4 1108
5 6453
6 36038
7 194173
8 1021432
9 5275885
10 26869458
11 135310457
12 675163708
13 3343196861
14 16447661790
15 80470971869
16 391822686752
17 1899839181365
18 9177752354378
19 44190339947417
20 212148874972196
21 1015791721800101

List of values

[1, 26, 169, 1108, 6453, 36038, 194173, 1021432, 5275885, 26869458, 135310457, 675163708, 3343196861, 16447661790, 80470971869, 391822686752, 1899839181365, 9177752354378, 44190339947417, 212148874972196, 1015791721800101]

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

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