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.

A209729 1/4 the number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock having distinct edge sums.

Table of values

n a(n)
1 22
2 124
3 696
4 3912
5 21976
6 123480
7 693752
8 3897880
9 21900088
10 123045592
11 691329528
12 3884227224
13 21823477432
14 122614931544
15 688910387576
16 3870634114072
17 21747107494456
18 122185841630680
19 686499566270712

List of values

[22, 124, 696, 3912, 21976, 123480, 693752, 3897880, 21900088, 123045592, 691329528, 3884227224, 21823477432, 122614931544, 688910387576, 3870634114072, 21747107494456, 122185841630680, 686499566270712]

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

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