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.

A302217 Number of 7Xn 0..1 arrays with every element equal to 0, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 64
2 21
3 1065
4 172
5 6423
6 8756
7 55922
8 465040
9 1136003
10 19265064
11 60547641
12 699553699
13 3796928584
14 26139308319
15 214325335931
16 1151196050162
17 10992872734396
18 60033419186727
19 538343914163895
20 3376563558675197

List of values

[64, 21, 1065, 172, 6423, 8756, 55922, 465040, 1136003, 19265064, 60547641, 699553699, 3796928584, 26139308319, 214325335931, 1151196050162, 10992872734396, 60033419186727, 538343914163895, 3376563558675197]

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

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