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.

A302742 Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 4
2 32
3 228
4 1637
5 11814
6 85268
7 615589
8 4444226
9 32085336
10 231641898
11 1672352613
12 12073650477
13 87166448968
14 629303444781
15 4543294244531
16 32800587324576
17 236805822155030
18 1709633941974433
19 12342805548255732
20 89109630466361141

List of values

[4, 32, 228, 1637, 11814, 85268, 615589, 4444226, 32085336, 231641898, 1672352613, 12073650477, 87166448968, 629303444781, 4543294244531, 32800587324576, 236805822155030, 1709633941974433, 12342805548255732, 89109630466361141]

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

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