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.

A303081 Number of nX5 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 1
2 72
3 258
4 1455
5 11767
6 84474
7 615471
8 4647197
9 35089147
10 266582788
11 2040291566
12 15688494163
13 121138647551
14 938798080313
15 7297261476590
16 56863460415074
17 444030008288805
18 3473279096665275
19 27207246337447767
20 213372255333189453

List of values

[1, 72, 258, 1455, 11767, 84474, 615471, 4647197, 35089147, 266582788, 2040291566, 15688494163, 121138647551, 938798080313, 7297261476590, 56863460415074, 444030008288805, 3473279096665275, 27207246337447767, 213372255333189453]

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

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