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.

A011948 Number of Barlow packings with group P63mc that repeat after 2n layers.

Table of values

n a(n)
6 1
7 1
8 4
9 7
10 18
11 31
12 70
13 126
14 261
15 484
16 960
17 1800
18 3514
19 6643
20 12852
21 24457
22 47151
23 90157
24 173740
25 333498
26 643230
27 1238664
28 2392650
29 4620006
30 8939657
31 17302033
32 33538048
33 65042495
34 126289800
35 245361171
36 477153040
37 928510506
38 1808276211
39 3523813566
40 6871685532
41 13408154100
42 26178323928
43 51139027135

List of values

[1, 1, 4, 7, 18, 31, 70, 126, 261, 484, 960, 1800, 3514, 6643, 12852, 24457, 47151, 90157, 173740, 333498, 643230, 1238664, 2392650, 4620006, 8939657, 17302033, 33538048, 65042495, 126289800, 245361171, 477153040, 928510506, 1808276211, 3523813566, 6871685532, 13408154100, 26178323928, 51139027135]

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

Content is available under The OEIS End-User License Agreement.