A023425 - cp's OEIS frontend

A023425 Generalized Catalan numbers: a(0) = 1, a(n) = a(n-1) + Sum_{k=1..n-4} a(k) * a(n-k).

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	5
7	13
8	34
9	90
10	241
11	652
12	1780
13	4899
14	13581
15	37893
16	106340
17	299978
18	850187
19	2419788
20	6913658
21	19822439
22	57015620
23	164476023
24	475752469
25	1379553027
26	4009532279
27	11678165796
28	34081307147
29	99646051271
30	291845778020
31	856147139606
32	2515368741707
33	7400713869808
34	21803597196231

[1, 1, 1, 1, 1, 2, 5, 13, 34, 90, 241, 652, 1780, 4899, 13581, 37893, 106340, 299978, 850187, 2419788, 6913658, 19822439, 57015620, 164476023, 475752469, 1379553027, 4009532279, 11678165796, 34081307147, 99646051271, 291845778020, 856147139606, 2515368741707, 7400713869808, 21803597196231]

cp's OEIS Frontend

A023425 Generalized Catalan numbers: a(0) = 1, a(n) = a(n-1) + Sum_{k=1..n-4} a(k) * a(n-k).

Table of values

List of values