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.

A207127 Number of 7Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 0 1 1 vertically.

Table of values

n a(n)
1 20
2 400
3 2340
4 13200
5 87744
6 475984
7 2330037
8 11635558
9 55554808
10 251535759
11 1124853720
12 4944356292
13 21187341735
14 89511994640
15 374050079444
16 1542084294888
17 6290403091560
18 25452983767264
19 102144395660496

List of values

[20, 400, 2340, 13200, 87744, 475984, 2330037, 11635558, 55554808, 251535759, 1124853720, 4944356292, 21187341735, 89511994640, 374050079444, 1542084294888, 6290403091560, 25452983767264, 102144395660496]

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

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