A151817 - cp's OEIS frontend

A151817 a(n) = 2(2n)!/n!.

n	a(n)
0	2
1	4
2	24
3	240
4	3360
5	60480
6	1330560
7	34594560
8	1037836800
9	35286451200
10	1340885145600
11	56317176115200
12	2590590101299200
13	129529505064960000
14	6994593273507840000
15	405686409863454720000
16	25152557411534192640000
17	1660068789161256714240000
18	116204815241287969996800000

[2, 4, 24, 240, 3360, 60480, 1330560, 34594560, 1037836800, 35286451200, 1340885145600, 56317176115200, 2590590101299200, 129529505064960000, 6994593273507840000, 405686409863454720000, 25152557411534192640000, 1660068789161256714240000, 116204815241287969996800000]

cp's OEIS Frontend

A151817 a(n) = 2(2n)!/n!.

Table of values

List of values

cp's OEIS Frontend

A151817 a(n) = 2*(2*n)!/n!.

Table of values

List of values

A151817 a(n) = 2(2n)!/n!.