A254408 - cp's OEIS frontend

A254408 a(n) = 2n^2binomial(2*n,n)^2, a closed form for a double binomial sum involving absolute values.

n	a(n)
0	0
1	8
2	288
3	7200
4	156800
5	3175200
6	61471872
7	1154305152
8	21201523200
9	382952512800
10	6826955907200
11	120427502203008
12	2105988385632768
13	36562298361680000
14	630861905459520000
15	10827650254927680000
16	184984389244186675200
17	3147624998233113895200
18	53368036302222346320000

[0, 8, 288, 7200, 156800, 3175200, 61471872, 1154305152, 21201523200, 382952512800, 6826955907200, 120427502203008, 2105988385632768, 36562298361680000, 630861905459520000, 10827650254927680000, 184984389244186675200, 3147624998233113895200, 53368036302222346320000]

cp's OEIS Frontend

A254408 a(n) = 2n^2binomial(2*n,n)^2, a closed form for a double binomial sum involving absolute values.

Table of values

List of values

cp's OEIS Frontend

A254408 a(n) = 2*n^2*binomial(2*n,n)^2, a closed form for a double binomial sum involving absolute values.

Table of values

List of values

A254408 a(n) = 2n^2binomial(2*n,n)^2, a closed form for a double binomial sum involving absolute values.