A166474 - cp's OEIS frontend

A166474 a(1)=1; a(2)=2; for n>2, a(n) = a(n-1) + A000217(n-1)*a(n-2).

n	a(n)
1	1
2	2
3	5
4	17
5	67
6	322
7	1729
8	10745
9	72989
10	556514
11	4570909
12	41300833
13	397831735
14	4156207538
15	45928539713
16	544673444273
17	6790954845241
18	90125991819010
19	1251379270355221
20	18375317715967121
21	281164964490563531
22	4525863356878968482

[1, 2, 5, 17, 67, 322, 1729, 10745, 72989, 556514, 4570909, 41300833, 397831735, 4156207538, 45928539713, 544673444273, 6790954845241, 90125991819010, 1251379270355221, 18375317715967121, 281164964490563531, 4525863356878968482]

cp's OEIS Frontend

A166474 a(1)=1; a(2)=2; for n>2, a(n) = a(n-1) + A000217(n-1)*a(n-2).

Table of values

List of values