A381199 - cp's OEIS frontend

A381199 a(n) = (4n)!/((n!)^2(2n)!)Sum_{k=0..n} binomial(n,k)^2binomial(2k,k).

n	a(n)
0	1
1	36
2	6300
3	1718640
4	575675100
5	216636756336
6	87874675224336
7	37563969509352000
8	16692217815436148700
9	7642084994921759382000
10	3582530520581922083974800
11	1712083670316898167464884800
12	831357643152788660610464490000
13	409154554816583487288034143528000
14	203690783136217174743485058666840000

[1, 36, 6300, 1718640, 575675100, 216636756336, 87874675224336, 37563969509352000, 16692217815436148700, 7642084994921759382000, 3582530520581922083974800, 1712083670316898167464884800, 831357643152788660610464490000, 409154554816583487288034143528000, 203690783136217174743485058666840000]

cp's OEIS Frontend

A381199 a(n) = (4n)!/((n!)^2(2n)!)Sum_{k=0..n} binomial(n,k)^2binomial(2k,k).

Table of values

List of values

cp's OEIS Frontend

A381199 a(n) = (4*n)!/((n!)^2*(2*n)!)*Sum_{k=0..n} binomial(n,k)^2*binomial(2*k,k).

Table of values

List of values

A381199 a(n) = (4n)!/((n!)^2(2n)!)Sum_{k=0..n} binomial(n,k)^2binomial(2k,k).