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.

A260839 Number of (n+2)X(6+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

Table of values

n a(n)
1 1320
2 1645
3 3470
4 6232
5 8646
6 19718
7 37882
8 58489
9 116930
10 248515
11 412314
12 751247
13 1604892
14 2935059
15 5115588
16 10451412
17 20331520
18 35935935
19 69439734
20 138338285
21 252687084
22 471920997
23 934503484
24 1761244126
25 3253322750
26 6325629935

List of values

[1320, 1645, 3470, 6232, 8646, 19718, 37882, 58489, 116930, 248515, 412314, 751247, 1604892, 2935059, 5115588, 10451412, 20331520, 35935935, 69439734, 138338285, 252687084, 471920997, 934503484, 1761244126, 3253322750, 6325629935]