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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.

A056711 Plug g.f. for A000108 (minus the leading 1), 1/2*(1-(1-4*x)^(1/2))/x - 1, into cycle index for dihedral group D_3.

Table of values

n a(n)
0 0
1 0
2 0
3 1
4 2
5 8
6 28
7 100
8 358
9 1309
10 4772
11 17556
12 64782
13 240090
14 892662
15 3329942
16 12456782
17 46725350
18 175698056
19 662193908
20 2501118956
21 9465771967
22 35891640172
23 136331485336
24 518702002350
25 1976588406300
26 7543137149256
27 28826327724850
28 110304963059048

List of values

[0, 0, 0, 1, 2, 8, 28, 100, 358, 1309, 4772, 17556, 64782, 240090, 892662, 3329942, 12456782, 46725350, 175698056, 662193908, 2501118956, 9465771967, 35891640172, 136331485336, 518702002350, 1976588406300, 7543137149256, 28826327724850, 110304963059048]

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

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