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.

A260833 Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

Table of values

n a(n)
1 48
2 131
3 700
4 2235
5 3828
6 19718
7 80516
8 181176
9 766388
10 3885356
11 12122540
12 43330160
13 229463444
14 972300920
15 3559612500
16 17890822312
17 91527500980

List of values

[48, 131, 700, 2235, 3828, 19718, 80516, 181176, 766388, 3885356, 12122540, 43330160, 229463444, 972300920, 3559612500, 17890822312, 91527500980]