A309473 - cp's OEIS frontend

A309473 a(n) = (-1)^n + Sum_{k=0..n-1} binomial(n-1,k) * a(k) * a(n-k-1).

n	a(n)
0	1
1	0
2	1
3	1
4	3
5	11
6	43
7	195
8	1063
9	6395
10	42371
11	311883
12	2501159
13	21672355
14	202544323
15	2028522067
16	21658255431
17	245738583307
18	2952508103651
19	37440976938875
20	499785548010759
21	7005210659040979
22	102862231664567651
23	1579045889274408259
24	25294106622048460903

[1, 0, 1, 1, 3, 11, 43, 195, 1063, 6395, 42371, 311883, 2501159, 21672355, 202544323, 2028522067, 21658255431, 245738583307, 2952508103651, 37440976938875, 499785548010759, 7005210659040979, 102862231664567651, 1579045889274408259, 25294106622048460903]

cp's OEIS Frontend

A309473 a(n) = (-1)^n + Sum_{k=0..n-1} binomial(n-1,k) * a(k) * a(n-k-1).

Table of values

List of values