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.

A178752 a(n) gives the number of conjugacy classes in the permutation group generated by transposition (1 2) and double n-cycle (1 3 5 7 ... 2n-1)(2 4 6 8 ... 2n). This group is a semidirect product formed by a cyclic group acting on an elementary abelian 2-group of rank n by cyclically permuting the factors.

Table of values

n a(n)
1 2
2 5
3 8
4 13
5 16
6 28
7 32
8 56
9 80
10 136
11 208
12 400
13 656
14 1232
15 2240
16 4192
17 7744
18 14728
19 27632
20 52664
21 99968
22 190984
23 364768
24 699760
25 1342256
26 2582120
27 4971248
28 9588880
29 18512848
30 35795104
31 69273728
32 134224064
33 260301632
34 505301920
35 981707008

List of values

[2, 5, 8, 13, 16, 28, 32, 56, 80, 136, 208, 400, 656, 1232, 2240, 4192, 7744, 14728, 27632, 52664, 99968, 190984, 364768, 699760, 1342256, 2582120, 4971248, 9588880, 18512848, 35795104, 69273728, 134224064, 260301632, 505301920, 981707008]

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

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