A023426 - cp's OEIS frontend

A023426 a(n) = a(n-1) + Sum_{k=0..n-4} a(k)*a(n-4-k), a(0) = 1. Generalized Catalan Numbers.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	4
6	7
7	11
8	18
9	32
10	59
11	107
12	191
13	343
14	627
15	1159
16	2146
17	3972
18	7373
19	13757
20	25781
21	48437
22	91165
23	171945
24	325096
25	616066
26	1169667
27	2224355
28	4236728
29	8082374
30	15441719
31	29542411
32	56590472
33	108532322
34	208387711
35	400551615
36	770710831
37	1484383399

[1, 1, 1, 1, 2, 4, 7, 11, 18, 32, 59, 107, 191, 343, 627, 1159, 2146, 3972, 7373, 13757, 25781, 48437, 91165, 171945, 325096, 616066, 1169667, 2224355, 4236728, 8082374, 15441719, 29542411, 56590472, 108532322, 208387711, 400551615, 770710831, 1484383399]

cp's OEIS Frontend

A023426 a(n) = a(n-1) + Sum_{k=0..n-4} a(k)*a(n-4-k), a(0) = 1. Generalized Catalan Numbers.

Table of values

List of values