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.

A303626 Number of 4Xn 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 8
2 3
3 148
4 325
5 3591
6 19467
7 160807
8 1173612
9 9421103
10 75073653
11 610163560
12 4982200456
13 40884018586
14 336380001790
15 2772144413449
16 22869613342371
17 188783964530800
18 1558985724471489
19 12877140629903061
20 106380021298938000

List of values

[8, 3, 148, 325, 3591, 19467, 160807, 1173612, 9421103, 75073653, 610163560, 4982200456, 40884018586, 336380001790, 2772144413449, 22869613342371, 188783964530800, 1558985724471489, 12877140629903061, 106380021298938000]

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

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