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.

A207404 Number of 4Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically.

Table of values

n a(n)
1 8
2 64
3 216
4 729
5 1782
6 4356
7 8910
8 18225
9 33210
10 60516
11 101598
12 170569
13 269276
14 425104
15 639612
16 962361
17 1393020
18 2016400
19 2827220
20 3964081
21 5411538
22 7387524
23 9858186
24 13155129
25 17213742
26 22524516
27 28974330
28 37271025
29 47228280
30 59845696

List of values

[8, 64, 216, 729, 1782, 4356, 8910, 18225, 33210, 60516, 101598, 170569, 269276, 425104, 639612, 962361, 1393020, 2016400, 2827220, 3964081, 5411538, 7387524, 9858186, 13155129, 17213742, 22524516, 28974330, 37271025, 47228280, 59845696]