A371758 - cp's OEIS frontend

A371758 a(n) = Sum_{k=0..floor(n/3)} binomial(2n-3k-1,n-3*k).

n	a(n)
0	1
1	1
2	3
3	11
4	39
5	141
6	519
7	1933
8	7263
9	27479
10	104543
11	399543
12	1532779
13	5899167
14	22766607
15	88073091
16	341425551
17	1326019653
18	5158412943
19	20096457549
20	78396460299
21	306190920837
22	1197181197567
23	4685523856881
24	18354865147011
25	71962695111841
26	282357198103815

[1, 1, 3, 11, 39, 141, 519, 1933, 7263, 27479, 104543, 399543, 1532779, 5899167, 22766607, 88073091, 341425551, 1326019653, 5158412943, 20096457549, 78396460299, 306190920837, 1197181197567, 4685523856881, 18354865147011, 71962695111841, 282357198103815]

cp's OEIS Frontend

A371758 a(n) = Sum_{k=0..floor(n/3)} binomial(2n-3k-1,n-3*k).

Table of values

List of values

cp's OEIS Frontend

A371758 a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-3*k-1,n-3*k).

Table of values

List of values

A371758 a(n) = Sum_{k=0..floor(n/3)} binomial(2n-3k-1,n-3*k).