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.

A207847 Number of 4 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 1 1 1 vertically.

Table of values

n a(n)
1 10
2 100
3 240
4 780
5 2320
6 7140
7 21600
8 65980
9 200400
10 610740
11 1857520
12 5656380
13 17211840
14 52396900
15 159466800
16 485403660
17 1477389520
18 4496881380
19 13687155360
20 41660429500
21 126802853520
22 385955704500
23 1174746099760
24 3575622750780

List of values

[10, 100, 240, 780, 2320, 7140, 21600, 65980, 200400, 610740, 1857520, 5656380, 17211840, 52396900, 159466800, 485403660, 1477389520, 4496881380, 13687155360, 41660429500, 126802853520, 385955704500, 1174746099760, 3575622750780]

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

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