A174549 - cp's OEIS frontend

A174549 a(n) = (2n-1)! + (2n)!.

n	a(n)
1	3
2	30
3	840
4	45360
5	3991680
6	518918400
7	93405312000
8	22230464256000
9	6758061133824000
10	2554547108585472000
11	1175091669949317120000
12	646300418472124416000000
13	418802671169936621568000000
14	315777214062132212662272000000
15	274094621805930760590852096000000

[3, 30, 840, 45360, 3991680, 518918400, 93405312000, 22230464256000, 6758061133824000, 2554547108585472000, 1175091669949317120000, 646300418472124416000000, 418802671169936621568000000, 315777214062132212662272000000, 274094621805930760590852096000000]

cp's OEIS Frontend

A174549 a(n) = (2n-1)! + (2n)!.

Table of values

List of values

cp's OEIS Frontend

A174549 a(n) = (2*n-1)! + (2*n)!.

Table of values

List of values

A174549 a(n) = (2n-1)! + (2n)!.