A217436 - cp's OEIS frontend

A217436 Triangular array read by rows. T(n,k) is the number of labeled relations on n elements with exactly k vertices of indegree and outdegree = 0.

n	a(n)
0	1
1	1
2	1
3	13
4	2
5	1
6	469
7	39
8	3
9	1
10	63577
11	1876
12	78
13	4
14	1
15	33231721
16	317885
17	4690
18	130
19	5
20	1
21	68519123173
22	199390326
23	953655
24	9380
25	195
26	6
27	1
28	562469619451069
29	479633862211
30	697866141
31	2225195
32	16415
33	273
34	7
35	1
36	18442242396353040817
37	4499756955608552
38	1918535448844
39	1860976376
40	4450390
41	26264
42	364
43	8
44	1

[1, 1, 1, 13, 2, 1, 469, 39, 3, 1, 63577, 1876, 78, 4, 1, 33231721, 317885, 4690, 130, 5, 1, 68519123173, 199390326, 953655, 9380, 195, 6, 1, 562469619451069, 479633862211, 697866141, 2225195, 16415, 273, 7, 1, 18442242396353040817, 4499756955608552, 1918535448844, 1860976376, 4450390, 26264, 364, 8, 1]

cp's OEIS Frontend

A217436 Triangular array read by rows. T(n,k) is the number of labeled relations on n elements with exactly k vertices of indegree and outdegree = 0.

Table of values

List of values