A226731 - cp's OEIS frontend

A226731 a(n) = (2n - 1)!/(2n).

n	a(n)
3	20
4	630
5	36288
6	3326400
7	444787200
8	81729648000
9	19760412672000
10	6082255020441600
11	2322315553259520000
12	1077167364120207360000
13	596585001666576384000000
14	388888194657798291456000000

[20, 630, 36288, 3326400, 444787200, 81729648000, 19760412672000, 6082255020441600, 2322315553259520000, 1077167364120207360000, 596585001666576384000000, 388888194657798291456000000]

cp's OEIS Frontend

A226731 a(n) = (2n - 1)!/(2n).

Table of values

List of values