A210587 - cp's OEIS frontend

A210587 Triangle T(n,k) read by rows: T(n,k) is the number of unrooted hypertrees on n labeled vertices with k hyperedges, n >= 2, 1 <= k <= n-1.

n	a(n)
2	1
3	1
4	3
5	1
6	12
7	16
8	1
9	35
10	150
11	125
12	1
13	90
14	900
15	2160
16	1296
17	1
18	217
19	4410
20	22295
21	36015
22	16807
23	1
24	504
25	19264
26	179200
27	573440
28	688128
29	262144
30	1
31	1143
32	78246
33	1240029
34	6889050
35	15707034
36	14880348
37	4782969
38	1
39	2550
40	302500
41	7770000
42	69510000
43	264600000
44	462000000
45	360000000
46	100000000

[1, 1, 3, 1, 12, 16, 1, 35, 150, 125, 1, 90, 900, 2160, 1296, 1, 217, 4410, 22295, 36015, 16807, 1, 504, 19264, 179200, 573440, 688128, 262144, 1, 1143, 78246, 1240029, 6889050, 15707034, 14880348, 4782969, 1, 2550, 302500, 7770000, 69510000, 264600000, 462000000, 360000000, 100000000]

cp's OEIS Frontend

A210587 Triangle T(n,k) read by rows: T(n,k) is the number of unrooted hypertrees on n labeled vertices with k hyperedges, n >= 2, 1 <= k <= n-1.

Table of values

List of values