A000897 - cp's OEIS frontend

A000897 a(n) = (4n)! / ((2n)!*n!^2).

n	a(n)
0	1
1	12
2	420
3	18480
4	900900
5	46558512
6	2498640144
7	137680171200
8	7735904619300
9	441233078286000
10	25467973278667920
11	1484298740174927040
12	87202550985276963600
13	5157850293780050462400
14	306839461354466267304000
15	18344908596179023234548480

[1, 12, 420, 18480, 900900, 46558512, 2498640144, 137680171200, 7735904619300, 441233078286000, 25467973278667920, 1484298740174927040, 87202550985276963600, 5157850293780050462400, 306839461354466267304000, 18344908596179023234548480]

cp's OEIS Frontend

A000897 a(n) = (4n)! / ((2n)!*n!^2).

Table of values

List of values

cp's OEIS Frontend

A000897 a(n) = (4*n)! / ((2*n)!*n!^2).

Table of values

List of values

A000897 a(n) = (4n)! / ((2n)!*n!^2).