A386202 - cp's OEIS frontend

A386202 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n-1,3k) a(3k) a(n-1-3*k).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	6
6	16
7	52
8	234
9	1018
10	4724
11	27864
12	166816
13	1018096
14	7421220
15	56215420
16	427276280
17	3714931512
18	33908654224
19	309043657936
20	3126424467816
21	33317327728936
22	354276443249552
23	4093007897140128
24	49813497858533344
25	605442506092221760
26	7871720463184084560

[1, 1, 1, 1, 2, 6, 16, 52, 234, 1018, 4724, 27864, 166816, 1018096, 7421220, 56215420, 427276280, 3714931512, 33908654224, 309043657936, 3126424467816, 33317327728936, 354276443249552, 4093007897140128, 49813497858533344, 605442506092221760, 7871720463184084560]

cp's OEIS Frontend

A386202 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n-1,3k) a(3k) a(n-1-3*k).

Table of values

List of values

cp's OEIS Frontend

A386202 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n-1,3*k) * a(3*k) * a(n-1-3*k).

Table of values

List of values

A386202 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n-1,3k) a(3k) a(n-1-3*k).