A351968 - cp's OEIS frontend

A351968 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n-1,3k) a(k) * a(n-3*k-1).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	6
6	16
7	37
8	114
9	478
10	1907
11	6777
12	28414
13	148580
14	758930
15	3580294
16	18982050
17	117888762
18	720679726
19	4193516446
20	26798335830
21	191775198574
22	1353198262531
23	9303932353127
24	69303156652024
25	559295471922890
26	4454686099742810
27	35198016469190740

[1, 1, 1, 1, 2, 6, 16, 37, 114, 478, 1907, 6777, 28414, 148580, 758930, 3580294, 18982050, 117888762, 720679726, 4193516446, 26798335830, 191775198574, 1353198262531, 9303932353127, 69303156652024, 559295471922890, 4454686099742810, 35198016469190740]

cp's OEIS Frontend

A351968 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n-1,3k) a(k) * a(n-3*k-1).

Table of values

List of values

cp's OEIS Frontend

A351968 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n-1,3*k) * a(k) * a(n-3*k-1).

Table of values

List of values

A351968 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n-1,3k) a(k) * a(n-3*k-1).