A201687 - cp's OEIS frontend

A201687 a(1)=0; a(n) = b(n) - Sum_{r=1..n-1} a(r)*b(n-1-r), where b(n) = A000085(n).

n	a(n)
1	0
2	2
3	2
4	6
5	14
6	44
7	134
8	462
9	1616
10	6062
11	23306
12	93996
13	389102
14	1671158
15	7360256
16	33418374
17	155359922
18	741476492
19	3617591462
20	18065875422
21	92087408048
22	479382896030
23	2543670789962
24	13759520646636
25	75769638724382
26	424727826838886
27	2420944511425472

[0, 2, 2, 6, 14, 44, 134, 462, 1616, 6062, 23306, 93996, 389102, 1671158, 7360256, 33418374, 155359922, 741476492, 3617591462, 18065875422, 92087408048, 479382896030, 2543670789962, 13759520646636, 75769638724382, 424727826838886, 2420944511425472]

cp's OEIS Frontend

A201687 a(1)=0; a(n) = b(n) - Sum_{r=1..n-1} a(r)*b(n-1-r), where b(n) = A000085(n).

Table of values

List of values