A001879 - cp's OEIS frontend

A001879 a(n) = (2n+2)!/(n!*2^(n+1)).

n	a(n)
0	1
1	6
2	45
3	420
4	4725
5	62370
6	945945
7	16216200
8	310134825
9	6547290750
10	151242416325
11	3794809718700
12	102776096548125
13	2988412653476250
14	92854250304440625
15	3070380543400170000
16	107655217802968460625
17	3989575718580595893750
18	155815096120119939628125

[1, 6, 45, 420, 4725, 62370, 945945, 16216200, 310134825, 6547290750, 151242416325, 3794809718700, 102776096548125, 2988412653476250, 92854250304440625, 3070380543400170000, 107655217802968460625, 3989575718580595893750, 155815096120119939628125]

cp's OEIS Frontend

A001879 a(n) = (2n+2)!/(n!*2^(n+1)).

Table of values

List of values