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.

A208424 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically.

Table of values

n a(n)
1 25
2 625
3 2625
4 26375
5 161975
6 1297475
7 8948825
8 67061525
9 479579725
10 3521095775
11 25468906525
12 185793853675
13 1348779310025
14 9818938648875
15 71365135739875
16 519177351902675
17 3774912413288375
18 27456054751647025
19 199657967390334825

List of values

[25, 625, 2625, 26375, 161975, 1297475, 8948825, 67061525, 479579725, 3521095775, 25468906525, 185793853675, 1348779310025, 9818938648875, 71365135739875, 519177351902675, 3774912413288375, 27456054751647025, 199657967390334825]

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

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