A260040 - cp's OEIS frontend

A260040 Triangle read by rows giving numbers H(n,k), number of classes of twin-tree-rooted maps with n edges whose root bond contains k edges.

n	a(n)
1	1
2	8
3	1
4	72
5	15
6	1
7	720
8	190
9	24
10	1
11	7780
12	2345
13	415
14	35
15	1
16	89040
17	29127
18	6384
19	798
20	48
21	1
22	1064644
23	367248
24	93324
25	15162
26	1400
27	63
28	1
29	13173216
30	4708344
31	1332528
32	261708
33	32400
34	2292
35	80
36	1
37	167522976
38	61343667
39	18829650
40	4271652
41	657198
42	63690
43	3555
44	99
45	1
46	2178520080
47	811147590
48	265116720
49	67358500
50	12269312
51	1506615
52	117040
53	5280
54	120
55	1

[1, 8, 1, 72, 15, 1, 720, 190, 24, 1, 7780, 2345, 415, 35, 1, 89040, 29127, 6384, 798, 48, 1, 1064644, 367248, 93324, 15162, 1400, 63, 1, 13173216, 4708344, 1332528, 261708, 32400, 2292, 80, 1, 167522976, 61343667, 18829650, 4271652, 657198, 63690, 3555, 99, 1, 2178520080, 811147590, 265116720, 67358500, 12269312, 1506615, 117040, 5280, 120, 1]

cp's OEIS Frontend

A260040 Triangle read by rows giving numbers H(n,k), number of classes of twin-tree-rooted maps with n edges whose root bond contains k edges.

Table of values

List of values