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.

A303625 Number of 3Xn 0..1 arrays with every element equal to 0, 2, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 4
2 2
3 38
4 68
5 362
6 1283
7 5411
8 22516
9 96189
10 417555
11 1829258
12 8090336
13 35972626
14 160686336
15 719920275
16 3232692431
17 14538525542
18 65457371351
19 294941937573
20 1329700498750
21 5997079537476
22 27054800037678
23 122076548954830

List of values

[4, 2, 38, 68, 362, 1283, 5411, 22516, 96189, 417555, 1829258, 8090336, 35972626, 160686336, 719920275, 3232692431, 14538525542, 65457371351, 294941937573, 1329700498750, 5997079537476, 27054800037678, 122076548954830]

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

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