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.

A269077 Number of 3 X n binary arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two not more than once.

Table of values

n a(n)
1 8
2 32
3 123
4 521
5 1887
6 7477
7 27042
8 102070
9 368391
10 1351259
11 4850557
12 17489481
13 62373468
14 222422348
15 788291635
16 2789267661
17 9831173339
18 34583332541
19 121320954422
20 424799241314
21 1484281289599
22 5177412026719
23 18028809567225

List of values

[8, 32, 123, 521, 1887, 7477, 27042, 102070, 368391, 1351259, 4850557, 17489481, 62373468, 222422348, 788291635, 2789267661, 9831173339, 34583332541, 121320954422, 424799241314, 1484281289599, 5177412026719, 18028809567225]

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

Content is available under The OEIS End-User License Agreement.