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.

A318340 Number of nX5 0..1 arrays with every element unequal to 0, 1, 2 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 16
2 42
3 76
4 148
5 393
6 1115
7 3321
8 10111
9 30943
10 95244
11 293401
12 904986
13 2792217
14 8617223
15 26597072
16 82096253
17 253412398
18 782236683
19 2414640760
20 7453642765
21 23008358869
22 71023687464
23 219240636280
24 676766784339
25 2089089700480

List of values

[16, 42, 76, 148, 393, 1115, 3321, 10111, 30943, 95244, 293401, 904986, 2792217, 8617223, 26597072, 82096253, 253412398, 782236683, 2414640760, 7453642765, 23008358869, 71023687464, 219240636280, 676766784339, 2089089700480]

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

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