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.

A032281 Number of bracelets (turnover necklaces) of n beads of 2 colors, 9 of them black.

Table of values

n a(n)
9 1
10 1
11 5
12 12
13 35
14 79
15 185
16 375
17 750
18 1387
19 2494
20 4262
21 7105
22 11410
23 17930
24 27407
25 41107
26 60335
27 87154
28 123695
29 173173
30 238957
31 325845
32 438945
33 585265
34 772252
35 1009868
36 1308742
37 1682660
38 2146420
39 2718806
40 3419924
41 4274905
42 5310667
43 6560225
44 8059021
45 9849925

List of values

[1, 1, 5, 12, 35, 79, 185, 375, 750, 1387, 2494, 4262, 7105, 11410, 17930, 27407, 41107, 60335, 87154, 123695, 173173, 238957, 325845, 438945, 585265, 772252, 1009868, 1308742, 1682660, 2146420, 2718806, 3419924, 4274905, 5310667, 6560225, 8059021, 9849925]

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

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