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.

A113182 Number of unrooted two-vertex (or, dually, two-face) regular planar maps of valency n considered up to orientation-preserving homeomorphism.

Table of values

n a(n)
1 1
2 1
3 2
4 3
5 7
6 14
7 39
8 95
9 308
10 859
11 3013
12 9130
13 33300
14 106039
15 394340
16 1297295
17 4878109
18 16428300
19 62232321
20 213388961
21 812825244
22 2827645453
23 10818489817
24 38086408002
25 146250545528
26 520062618300
27 2003199281223
28 7184570776213

List of values

[1, 1, 2, 3, 7, 14, 39, 95, 308, 859, 3013, 9130, 33300, 106039, 394340, 1297295, 4878109, 16428300, 62232321, 213388961, 812825244, 2827645453, 10818489817, 38086408002, 146250545528, 520062618300, 2003199281223, 7184570776213]

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

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