A352428 - cp's OEIS frontend

A352428 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n,3k+1) a(n-3*k-1).

n	a(n)
0	1
1	1
2	2
3	6
4	25
5	130
6	810
7	5881
8	48806
9	455706
10	4727881
11	53955682
12	671730246
13	9059714665
14	131588822822
15	2047796305470
16	33992509701721
17	599526848094850
18	11195864285933682
19	220692569175568729
20	4579248276057441926
21	99767702172338210898
22	2277136869014579978473
23	54336724559407913237122

[1, 1, 2, 6, 25, 130, 810, 5881, 48806, 455706, 4727881, 53955682, 671730246, 9059714665, 131588822822, 2047796305470, 33992509701721, 599526848094850, 11195864285933682, 220692569175568729, 4579248276057441926, 99767702172338210898, 2277136869014579978473, 54336724559407913237122]

cp's OEIS Frontend

A352428 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n,3k+1) a(n-3*k-1).

Table of values

List of values

cp's OEIS Frontend

A352428 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n,3*k+1) * a(n-3*k-1).

Table of values

List of values

A352428 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} binomial(n,3k+1) a(n-3*k-1).