A351798 - cp's OEIS frontend

A351798 a(0) = 1; a(n) = (1/2) * Sum_{k=0..n-1} (k+1) * (k+2) * a(k) * a(n-k-1).

n	a(n)
0	1
1	1
2	4
3	31
4	377
5	6531
6	152452
7	4619130
8	176631345
9	8334329638
10	476245005316
11	32437793281489
12	2597918907028430
13	241796318654003869
14	25886976434072903664
15	3159556047500264255868
16	436160347706069120482893
17	67621917400663695356651589
18	11700923494462411106797164208

[1, 1, 4, 31, 377, 6531, 152452, 4619130, 176631345, 8334329638, 476245005316, 32437793281489, 2597918907028430, 241796318654003869, 25886976434072903664, 3159556047500264255868, 436160347706069120482893, 67621917400663695356651589, 11700923494462411106797164208]

cp's OEIS Frontend

A351798 a(0) = 1; a(n) = (1/2) * Sum_{k=0..n-1} (k+1) * (k+2) * a(k) * a(n-k-1).

Table of values

List of values