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.

A302966 Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 4
2 32
3 154
4 786
5 3924
6 19868
7 100161
8 505908
9 2554201
10 12898093
11 65130456
12 328890172
13 1660800969
14 8386586118
15 42349950959
16 213855666444
17 1079912639341
18 5453263882696
19 27537493309346
20 139056822182155
21 702198983497508

List of values

[4, 32, 154, 786, 3924, 19868, 100161, 505908, 2554201, 12898093, 65130456, 328890172, 1660800969, 8386586118, 42349950959, 213855666444, 1079912639341, 5453263882696, 27537493309346, 139056822182155, 702198983497508]

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

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