A119649 - cp's OEIS frontend

A119649 a(0)=0, a(1)=1; for n >= 1, a(n+1) = (n+2)a(n) + 2Sum_{k=2..n-1} binomial(n, k)a(k)a(n-k+1).

n	a(n)
0	0
1	1
2	3
3	12
4	114
5	1404
6	22968
7	456408
8	10762992
9	292851648
10	9038285280
11	311858347968
12	11896746473088
13	497156854363776
14	22586083785232128
15	1108320770197398528
16	58420751739908940288
17	3292054745517600648192
18	197491129333671926863872
19	12566253138627465234487296

[0, 1, 3, 12, 114, 1404, 22968, 456408, 10762992, 292851648, 9038285280, 311858347968, 11896746473088, 497156854363776, 22586083785232128, 1108320770197398528, 58420751739908940288, 3292054745517600648192, 197491129333671926863872, 12566253138627465234487296]

cp's OEIS Frontend

A119649 a(0)=0, a(1)=1; for n >= 1, a(n+1) = (n+2)a(n) + 2Sum_{k=2..n-1} binomial(n, k)a(k)a(n-k+1).

Table of values

List of values

cp's OEIS Frontend

A119649 a(0)=0, a(1)=1; for n >= 1, a(n+1) = (n+2)*a(n) + 2*Sum_{k=2..n-1} binomial(n, k)*a(k)*a(n-k+1).

Table of values

List of values

A119649 a(0)=0, a(1)=1; for n >= 1, a(n+1) = (n+2)a(n) + 2Sum_{k=2..n-1} binomial(n, k)a(k)a(n-k+1).