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.

A303086 Number of 4Xn 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 8
2 3
3 112
4 90
5 1455
6 3667
7 33152
8 157838
9 1161232
10 7100035
11 49678916
12 329669849
13 2281641594
14 15540614996
15 107301648292
16 737154651791
17 5087197252026
18 35051028229325
19 241871543186476
20 1668193998276026
21 11511498465288360

List of values

[8, 3, 112, 90, 1455, 3667, 33152, 157838, 1161232, 7100035, 49678916, 329669849, 2281641594, 15540614996, 107301648292, 737154651791, 5087197252026, 35051028229325, 241871543186476, 1668193998276026, 11511498465288360]

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

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