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.

A207924 Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 1 1 1 vertically.

Table of values

n a(n)
1 9
2 81
3 144
4 576
5 1936
6 6400
7 21904
8 73984
9 250000
10 846400
11 2862864
12 9684544
13 32764176
14 110838784
15 374964496
16 1268499456
17 4291298064
18 14517358144
19 49111878544
20 166144281664
21 562062085264
22 1901442429184
23 6432533627536

List of values

[9, 81, 144, 576, 1936, 6400, 21904, 73984, 250000, 846400, 2862864, 9684544, 32764176, 110838784, 374964496, 1268499456, 4291298064, 14517358144, 49111878544, 166144281664, 562062085264, 1901442429184, 6432533627536]

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

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