A136206 - cp's OEIS frontend

A136206 Triangle H(n,j) (n=1,2,3,..., j=2,3,4,...) read by rows: let X(k,l,n) := Stirling2(n,k)*Stirling2(k,l) for 1<=k<=n and 1<=l<=k. Then H(n,j)= sum_{k+l=j, 1<=k<=n and 1<=l<=k} X(k,l,n).

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	3
7	4
8	3
9	1
10	1
11	7
12	13
13	19
14	13
15	6
16	1
17	1
18	15
19	40
20	85
21	96
22	75
23	35
24	10
25	1
26	1
27	31
28	121
29	335
30	560
31	616
32	471
33	240
34	80
35	15
36	1
37	1
38	63
39	364
40	1253
41	2891
42	4221
43	4502
44	3353
45	1806
46	665
47	161
48	21
49	1
50	1
51	127
52	1093
53	4599
54	13923
55	26222
56	36225
57	36205
58	26895
59	14756
60	5887
61	1638
62	294
63	28
64	1

[1, 1, 1, 1, 1, 3, 4, 3, 1, 1, 7, 13, 19, 13, 6, 1, 1, 15, 40, 85, 96, 75, 35, 10, 1, 1, 31, 121, 335, 560, 616, 471, 240, 80, 15, 1, 1, 63, 364, 1253, 2891, 4221, 4502, 3353, 1806, 665, 161, 21, 1, 1, 127, 1093, 4599, 13923, 26222, 36225, 36205, 26895, 14756, 5887, 1638, 294, 28, 1]

cp's OEIS Frontend

A136206 Triangle H(n,j) (n=1,2,3,..., j=2,3,4,...) read by rows: let X(k,l,n) := Stirling2(n,k)*Stirling2(k,l) for 1<=k<=n and 1<=l<=k. Then H(n,j)= sum_{k+l=j, 1<=k<=n and 1<=l<=k} X(k,l,n).

Table of values

List of values