A176758 - cp's OEIS frontend

A176758 a(n) = Sum_{k=0..floor((n-1)/2)} (3^k-1)binomial(n, 2k+1).

n	a(n)
3	2
4	8
5	28
6	88
7	264
8	768
9	2192
10	6176
11	17248
12	47872
13	132288
14	364416
15	1001600
16	2748416
17	7532800
18	20627968
19	56452608
20	154423296
21	422276096
22	1154447360
23	3155544064
24	8624177152
25	23567831040
26	64400793600
27	175970803712
28	480810303488

[2, 8, 28, 88, 264, 768, 2192, 6176, 17248, 47872, 132288, 364416, 1001600, 2748416, 7532800, 20627968, 56452608, 154423296, 422276096, 1154447360, 3155544064, 8624177152, 23567831040, 64400793600, 175970803712, 480810303488]

cp's OEIS Frontend

A176758 a(n) = Sum_{k=0..floor((n-1)/2)} (3^k-1)binomial(n, 2k+1).

Table of values

List of values

cp's OEIS Frontend

A176758 a(n) = Sum_{k=0..floor((n-1)/2)} (3^k-1)*binomial(n, 2*k+1).

Table of values

List of values

A176758 a(n) = Sum_{k=0..floor((n-1)/2)} (3^k-1)binomial(n, 2k+1).