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.

A113201 Number of isomorphism classes of simple quadrangulations of the sphere having n vertices and n-2 faces, with orientation-reversing isomorphisms permitted.

Table of values

n a(n)
4 1
5 1
6 2
7 3
8 9
9 18
10 62
11 198
12 803
13 3378
14 15882
15 77185
16 393075
17 2049974
18 10938182
19 59312272
20 326258544
21 1815910231
22 10213424233
23 57974895671
24 331820721234
25 1913429250439
26 11109119321058
27 64901418126997

List of values

[1, 1, 2, 3, 9, 18, 62, 198, 803, 3378, 15882, 77185, 393075, 2049974, 10938182, 59312272, 326258544, 1815910231, 10213424233, 57974895671, 331820721234, 1913429250439, 11109119321058, 64901418126997]

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

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