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.

A303247 Number of 7Xn 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 64
2 21
3 1465
4 458
5 23995
6 41878
7 686376
8 4288552
9 44547581
10 435326091
11 4420070682
12 46247239309
13 488935478096
14 5159966424970
15 55400725550050
16 589318077173963
17 6332575656503077
18 67765552380120662
19 727276471899440959

List of values

[64, 21, 1465, 458, 23995, 41878, 686376, 4288552, 44547581, 435326091, 4420070682, 46247239309, 488935478096, 5159966424970, 55400725550050, 589318077173963, 6332575656503077, 67765552380120662, 727276471899440959]

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

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