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.

A207351 Number of 7Xn 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 42
2 1764
3 8928
4 43260
5 186002
6 684324
7 2367656
8 8000806
9 26057006
10 82907430
11 260627110
12 806084422
13 2476671718
14 7545089216
15 22861190904
16 68993933764
17 207422313718
18 622180142516
19 1862113694818
20 5564560256320
21 16608301418960

List of values

[42, 1764, 8928, 43260, 186002, 684324, 2367656, 8000806, 26057006, 82907430, 260627110, 806084422, 2476671718, 7545089216, 22861190904, 68993933764, 207422313718, 622180142516, 1862113694818, 5564560256320, 16608301418960]

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

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