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.

A006424 Number of rooted toroidal maps with 4 faces and n vertices and without separating cycles or isthmuses.

Table of values

n a(n)
1 20
2 831
3 12656
4 109075
5 648792
6 2978245
7 11293436
8 36973989
9 107727724
10 285451894
11 699013380
12 1601397330
13 3465135024
14 7135903782
15 14072047976
16 26707904230
17 48991682628
18 87164772761
19 150869282184
20 254695011933
21 420306632200
22 679327313795
23 1077197343300
24 1678276223715

List of values

[20, 831, 12656, 109075, 648792, 2978245, 11293436, 36973989, 107727724, 285451894, 699013380, 1601397330, 3465135024, 7135903782, 14072047976, 26707904230, 48991682628, 87164772761, 150869282184, 254695011933, 420306632200, 679327313795, 1077197343300, 1678276223715]

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

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