A186738 - cp's OEIS frontend

A186738 a(0)=0, a(1)=0; for n>1, a(n) = a(n-1) + (n-1)*a(n-2) + 1.

n	a(n)
0	0
1	0
2	1
3	2
4	6
5	15
6	46
7	137
8	460
9	1557
10	5698
11	21269
12	83948
13	339177
14	1430502
15	6178981
16	27636512
17	126500209
18	596320914
19	2873324677
20	14203422044
21	71669915585
22	369941778510
23	1946679921381

[0, 0, 1, 2, 6, 15, 46, 137, 460, 1557, 5698, 21269, 83948, 339177, 1430502, 6178981, 27636512, 126500209, 596320914, 2873324677, 14203422044, 71669915585, 369941778510, 1946679921381]

cp's OEIS Frontend

A186738 a(0)=0, a(1)=0; for n>1, a(n) = a(n-1) + (n-1)*a(n-2) + 1.

Table of values

List of values