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.

A207789 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 0 and 1 0 1 vertically.

Table of values

n a(n)
1 28
2 784
3 4000
4 19041
5 75557
6 246087
7 786907
8 2283773
9 6379507
10 17308075
11 45325727
12 117028904
13 296766998
14 743643327
15 1848943779
16 4561246099
17 11201879231
18 27401795310
19 66825353776
20 162629732740
21 395022399526
22 958122589330

List of values

[28, 784, 4000, 19041, 75557, 246087, 786907, 2283773, 6379507, 17308075, 45325727, 117028904, 296766998, 743643327, 1848943779, 4561246099, 11201879231, 27401795310, 66825353776, 162629732740, 395022399526, 958122589330]

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

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