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.

A259218 Number of (n+1) X (4+1) 0..1 arrays with each 2 X 2 subblock having clockwise pattern 0000 0011 or 0101.

Table of values

n a(n)
1 45
2 71
3 112
4 183
5 303
6 510
7 869
8 1499
9 2616
10 4619
11 8251
12 14910
13 27249
14 50343
15 93968
16 177071
17 336567
18 644702
19 1243405
20 2412387
21 4704360
22 9213891
23 18112547
24 35715038
25 70604793
26 139874255
27 277587904
28 551679879
29 1097703231
30 2186254014
31 4357699061

List of values

[45, 71, 112, 183, 303, 510, 869, 1499, 2616, 4619, 8251, 14910, 27249, 50343, 93968, 177071, 336567, 644702, 1243405, 2412387, 4704360, 9213891, 18112547, 35715038, 70604793, 139874255, 277587904, 551679879, 1097703231, 2186254014, 4357699061]

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

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