A137855 - cp's OEIS frontend

A137855 Triangle read by rows: T(n,k) = Sum_{j=1..n-k+1} Stirling2(k, j).

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	2
9	4
10	1
11	1
12	2
13	5
14	8
15	1
16	1
17	2
18	5
19	14
20	16
21	1
22	1
23	2
24	5
25	15
26	41
27	32
28	1
29	1
30	2
31	5
32	15
33	51
34	122
35	64
36	1
37	1
38	2
39	5
40	15
41	52
42	187
43	365
44	128
45	1
46	1
47	2
48	5
49	15
50	52
51	202
52	715
53	1094
54	256
55	1
56	1
57	2
58	5
59	15
60	52
61	203
62	855
63	2795
64	3281
65	512
66	1

[1, 1, 1, 1, 2, 1, 1, 2, 4, 1, 1, 2, 5, 8, 1, 1, 2, 5, 14, 16, 1, 1, 2, 5, 15, 41, 32, 1, 1, 2, 5, 15, 51, 122, 64, 1, 1, 2, 5, 15, 52, 187, 365, 128, 1, 1, 2, 5, 15, 52, 202, 715, 1094, 256, 1, 1, 2, 5, 15, 52, 203, 855, 2795, 3281, 512, 1]

cp's OEIS Frontend

A137855 Triangle read by rows: T(n,k) = Sum_{j=1..n-k+1} Stirling2(k, j).

Table of values

List of values