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.

A284108 Number of n X 3 0..1 arrays with the number of 1's king-move adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

Table of values

n a(n)
1 3
2 13
3 25
4 435
5 1230
6 20275
7 67957
8 1057769
9 4091201
10 57977326
11 251405237
12 3267210309
13 15553103766
14 187647577263
15 965234391129
16 10933376520347
17 60012823834203
18 644348267987097
19 3735767137025182
20 38329302231936856

List of values

[3, 13, 25, 435, 1230, 20275, 67957, 1057769, 4091201, 57977326, 251405237, 3267210309, 15553103766, 187647577263, 965234391129, 10933376520347, 60012823834203, 644348267987097, 3735767137025182, 38329302231936856]

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

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