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.

A269921 Triangle read by rows: T(n,f) is the number of rooted maps with n edges and f faces on an orientable surface of genus 1.

Table of values

n a(n)
2 1
3 10
4 10
5 70
6 167
7 70
8 420
9 1720
10 1720
11 420
12 2310
13 14065
14 24164
15 14065
16 2310
17 12012
18 100156
19 256116
20 256116
21 100156
22 12012
23 60060
24 649950
25 2278660
26 3392843
27 2278660
28 649950
29 60060
30 291720
31 3944928
32 17970784
33 36703824
34 36703824
35 17970784

List of values

[1, 10, 10, 70, 167, 70, 420, 1720, 1720, 420, 2310, 14065, 24164, 14065, 2310, 12012, 100156, 256116, 256116, 100156, 12012, 60060, 649950, 2278660, 3392843, 2278660, 649950, 60060, 291720, 3944928, 17970784, 36703824, 36703824, 17970784]

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

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