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.

A207247 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 0 vertically.

Table of values

n a(n)
1 31
2 961
3 6759
4 44730
5 228110
6 886959
7 3510185
8 11662500
9 37779767
10 116530737
11 339866809
12 977292885
13 2712629425
14 7395159649
15 19850488276
16 52392219734
17 136945372844
18 354108951154
19 908054491477
20 2312990201683
21 5853875753478

List of values

[31, 961, 6759, 44730, 228110, 886959, 3510185, 11662500, 37779767, 116530737, 339866809, 977292885, 2712629425, 7395159649, 19850488276, 52392219734, 136945372844, 354108951154, 908054491477, 2312990201683, 5853875753478]

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

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