A375565 - cp's OEIS frontend

A375565 a(n) = Sum_{k=0..floor(n/3)} (n-2k+1) binomial(n-2*k,k)^2.

n	a(n)
0	1
1	2
2	3
3	6
4	17
5	42
6	90
7	194
8	441
9	1006
10	2242
11	4950
12	10974
13	24376
14	53961
15	119048
16	262337
17	577782
18	1271117
19	2792718
20	6129342
21	13441616
22	29454517
23	64492800
24	141108878
25	308542280
26	674238780
27	1472532300
28	3214268735
29	7012637490
30	15292425923
31	33333338466
32	72627184389

[1, 2, 3, 6, 17, 42, 90, 194, 441, 1006, 2242, 4950, 10974, 24376, 53961, 119048, 262337, 577782, 1271117, 2792718, 6129342, 13441616, 29454517, 64492800, 141108878, 308542280, 674238780, 1472532300, 3214268735, 7012637490, 15292425923, 33333338466, 72627184389]

cp's OEIS Frontend

A375565 a(n) = Sum_{k=0..floor(n/3)} (n-2k+1) binomial(n-2*k,k)^2.

Table of values

List of values

cp's OEIS Frontend

A375565 a(n) = Sum_{k=0..floor(n/3)} (n-2*k+1) * binomial(n-2*k,k)^2.

Table of values

List of values

A375565 a(n) = Sum_{k=0..floor(n/3)} (n-2k+1) binomial(n-2*k,k)^2.