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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.

A103942 Number of unrooted n-edge isthmusless maps in the plane (planar with a distinguished outside face).

Table of values

n a(n)
0 1
1 1
2 3
3 9
4 38
5 187
6 1120
7 7083
8 47990
9 337676
10 2455517
11 18310155
12 139447034
13 1080773098
14 8502896424
15 67763884363
16 546147639926
17 4445389286380
18 36501274080076
19 302060508150976
20 2517213486505592
21 21110062391001119
22 178052027949519768
23 1509631210682469661
24 12860805940582898474

List of values

[1, 1, 3, 9, 38, 187, 1120, 7083, 47990, 337676, 2455517, 18310155, 139447034, 1080773098, 8502896424, 67763884363, 546147639926, 4445389286380, 36501274080076, 302060508150976, 2517213486505592, 21110062391001119, 178052027949519768, 1509631210682469661, 12860805940582898474]

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

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