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.

A207342 Number of nX4 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 0 and 1 1 1 vertically.

Table of values

n a(n)
1 9
2 81
3 192
4 828
5 3130
6 11230
7 43260
8 163710
9 604340
10 2295512
11 8644786
12 32247604
13 121846736
14 458125776
15 1716149678
16 6468493030
17 24309087961
18 91233180855
19 343432736925
20 1290560157455
21 4847684885645
22 18235756500631
23 68530310193276

List of values

[9, 81, 192, 828, 3130, 11230, 43260, 163710, 604340, 2295512, 8644786, 32247604, 121846736, 458125776, 1716149678, 6468493030, 24309087961, 91233180855, 343432736925, 1290560157455, 4847684885645, 18235756500631, 68530310193276]

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

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