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.

A186464 Number of (n+1) X 2 0..2 arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.

Table of values

n a(n)
1 81
2 83
3 277
4 367
5 966
6 1321
7 3078
8 4553
9 10028
10 15650
11 32786
12 53166
13 107524
14 179614
15 353932
16 604474
17 1168188
18 2028530
19 3863852
20 6793514
21 12800564
22 22716978
23 42458812
24 75878698
25 140963524
26 253237282
27 468324588
28 844629530
29 1556731220

List of values

[81, 83, 277, 367, 966, 1321, 3078, 4553, 10028, 15650, 32786, 53166, 107524, 179614, 353932, 604474, 1168188, 2028530, 3863852, 6793514, 12800564, 22716978, 42458812, 75878698, 140963524, 253237282, 468324588, 844629530, 1556731220]

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

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