A335987 - cp's OEIS frontend

A335987 Triangular array read by rows: T(n,k) is the number of labeled quasi-orders on [n] that are composed of exactly k irreducible components n>=0, 0<=k<=n.

n	a(n)
0	1
1	0
2	1
3	0
4	2
5	2
6	0
7	11
8	12
9	6
10	0
11	147
12	112
13	72
14	24
15	0
16	3412
17	1910
18	1020
19	480
20	120
21	0
22	121553
23	52184
24	21870
25	9600
26	3600
27	720
28	0
29	6353629
30	2101540
31	693672
32	254520
33	96600
34	30240
35	5040
36	0
37	476850636
38	120988214
39	31163496
40	9289728
41	3116400
42	1048320
43	282240
44	40320

[1, 0, 1, 0, 2, 2, 0, 11, 12, 6, 0, 147, 112, 72, 24, 0, 3412, 1910, 1020, 480, 120, 0, 121553, 52184, 21870, 9600, 3600, 720, 0, 6353629, 2101540, 693672, 254520, 96600, 30240, 5040, 0, 476850636, 120988214, 31163496, 9289728, 3116400, 1048320, 282240, 40320]

cp's OEIS Frontend

A335987 Triangular array read by rows: T(n,k) is the number of labeled quasi-orders on [n] that are composed of exactly k irreducible components n>=0, 0<=k<=n.

Table of values

List of values