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.

A207069 Number of 2 X n 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.

Table of values

n a(n)
1 4
2 16
3 36
4 81
5 196
6 441
7 961
8 2116
9 4624
10 10000
11 21609
12 46656
13 100489
14 216225
15 465124
16 1000000
17 2149156
18 4618201
19 9922500
20 21316689
21 45792289
22 98366724
23 211295296
24 453860416
25 974875729
26 2093977600
27 4497714225
28 9660727521
29 20750402500

List of values

[4, 16, 36, 81, 196, 441, 961, 2116, 4624, 10000, 21609, 46656, 100489, 216225, 465124, 1000000, 2149156, 4618201, 9922500, 21316689, 45792289, 98366724, 211295296, 453860416, 974875729, 2093977600, 4497714225, 9660727521, 20750402500]