A247232 - cp's OEIS frontend

A247232 Triangular array read by rows: T(n,k) is the number of pre-orders on an n-set with exactly k connected components in its digraph representation, n>=1, 1<=k<=n.

n	a(n)
1	1
2	3
3	1
4	19
5	9
6	1
7	233
8	103
9	18
10	1
11	4851
12	1735
13	325
14	30
15	1
16	158175
17	43201
18	7320
19	785
20	45
21	1
22	7724333
23	1567783
24	218491
25	22960
26	1610
27	63
28	1
29	550898367
30	82142943
31	8856974
32	818461
33	59570
34	2954
35	84
36	1
37	56536880923
38	6187176225
39	496368181
40	37205658
41	2518131
42	135198
43	4998
44	108
45	1

[1, 3, 1, 19, 9, 1, 233, 103, 18, 1, 4851, 1735, 325, 30, 1, 158175, 43201, 7320, 785, 45, 1, 7724333, 1567783, 218491, 22960, 1610, 63, 1, 550898367, 82142943, 8856974, 818461, 59570, 2954, 84, 1, 56536880923, 6187176225, 496368181, 37205658, 2518131, 135198, 4998, 108, 1]

cp's OEIS Frontend

A247232 Triangular array read by rows: T(n,k) is the number of pre-orders on an n-set with exactly k connected components in its digraph representation, n>=1, 1<=k<=n.

Table of values

List of values