A134055 - cp's OEIS frontend

A134055 a(n) = Sum_{k=1..n} C(n-1,k-1) * S2(n,k) for n>0, a(0)=1, where S2(n,k) = A048993(n,k) are Stirling numbers of the 2nd kind.

n	a(n)
0	1
1	1
2	2
3	8
4	41
5	252
6	1782
7	14121
8	123244
9	1169832
10	11960978
11	130742196
12	1518514076
13	18645970943
14	241030821566
15	3268214127548
16	46338504902485
17	685145875623056
18	10538790233183702
19	168282662416550040
20	2784205185437851772
21	47646587512911994120

[1, 1, 2, 8, 41, 252, 1782, 14121, 123244, 1169832, 11960978, 130742196, 1518514076, 18645970943, 241030821566, 3268214127548, 46338504902485, 685145875623056, 10538790233183702, 168282662416550040, 2784205185437851772, 47646587512911994120]

cp's OEIS Frontend

A134055 a(n) = Sum_{k=1..n} C(n-1,k-1) * S2(n,k) for n>0, a(0)=1, where S2(n,k) = A048993(n,k) are Stirling numbers of the 2nd kind.

Table of values

List of values