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.

A238396 Triangle T(n,k) read by rows: T(n,k) is the number of rooted genus-k maps with n edges, n>=0, 0<=k<=n.

Table of values

n a(n)
0 1
1 2
2 0
3 9
4 1
5 0
6 54
7 20
8 0
9 0
10 378
11 307
12 21
13 0
14 0
15 2916
16 4280
17 966
18 0
19 0
20 0
21 24057
22 56914
23 27954
24 1485
25 0
26 0
27 0
28 208494
29 736568
30 650076
31 113256
32 0
33 0
34 0
35 0
36 1876446
37 9370183
38 13271982
39 5008230
40 225225
41 0
42 0
43 0
44 0
45 17399772
46 117822512
47 248371380
48 167808024
49 24635754
50 0
51 0
52 0
53 0
54 0
55 165297834
56 1469283166
57 4366441128
58 4721384790
59 1495900107
60 59520825
61 0

List of values

[1, 2, 0, 9, 1, 0, 54, 20, 0, 0, 378, 307, 21, 0, 0, 2916, 4280, 966, 0, 0, 0, 24057, 56914, 27954, 1485, 0, 0, 0, 208494, 736568, 650076, 113256, 0, 0, 0, 0, 1876446, 9370183, 13271982, 5008230, 225225, 0, 0, 0, 0, 17399772, 117822512, 248371380, 167808024, 24635754, 0, 0, 0, 0, 0, 165297834, 1469283166, 4366441128, 4721384790, 1495900107, 59520825, 0]