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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.

A069729 Number of rooted non-separable bi-Eulerian planar maps with 2n edges. Bi-Eulerian means all its vertices and faces are of even valency.

Table of values

n a(n)
0 1
1 1
2 2
3 8
4 54
5 442
6 4032
7 39706
8 413358
9 4487693
10 50348500
11 579994802
12 6827955072
13 81854670861
14 996529292432
15 12293898494952
16 153421680489694
17 1934041122204318
18 24599034335501730
19 315369011873625930
20 4072021557616191708
21 52915860528084306704
22 691646518495876375968

List of values

[1, 1, 2, 8, 54, 442, 4032, 39706, 413358, 4487693, 50348500, 579994802, 6827955072, 81854670861, 996529292432, 12293898494952, 153421680489694, 1934041122204318, 24599034335501730, 315369011873625930, 4072021557616191708, 52915860528084306704, 691646518495876375968]

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

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