A304202 - cp's OEIS frontend

A304202 a(n) = (2n-3)4^(n-1) - 2binomial(2n, n-1).

n	a(n)
3	18
4	208
5	1372
6	7632
7	39050
8	190112
9	895524
10	4120528
11	18629652
12	83088096
13	366560568
14	1602837280
15	6956911962
16	30007067456
17	128736063316
18	549740689872
19	2338025684540
20	9907917740128
21	41853370268424
22	176294674155104
23	740683257681988
24	3104678088923328
25	12986226585328232

[18, 208, 1372, 7632, 39050, 190112, 895524, 4120528, 18629652, 83088096, 366560568, 1602837280, 6956911962, 30007067456, 128736063316, 549740689872, 2338025684540, 9907917740128, 41853370268424, 176294674155104, 740683257681988, 3104678088923328, 12986226585328232]

cp's OEIS Frontend

A304202 a(n) = (2n-3)4^(n-1) - 2binomial(2n, n-1).

Table of values

List of values

cp's OEIS Frontend

A304202 a(n) = (2*n-3)*4^(n-1) - 2*binomial(2*n, n-1).

Table of values

List of values

A304202 a(n) = (2n-3)4^(n-1) - 2binomial(2n, n-1).