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.

A006427 Number of rooted toroidal maps with 4 vertices and n faces and no isthmuses.

Table of values

n a(n)
1 20
2 1071
3 26320
4 431739
5 5494896
6 58677420
7 550712668
8 4681144391
9 36786186216
10 271221867098
11 1896796135920
12 12688048319278
13 81709791432384
14 509222462694582
15 3083998029716868
16 18213177504318335
17 105186858991413976
18 595499805083872458
19 3311524095424508480

List of values

[20, 1071, 26320, 431739, 5494896, 58677420, 550712668, 4681144391, 36786186216, 271221867098, 1896796135920, 12688048319278, 81709791432384, 509222462694582, 3083998029716868, 18213177504318335, 105186858991413976, 595499805083872458, 3311524095424508480]

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

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