A061778 - OEIS

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A061778 as a simple table

n	a(n)
1	1
2	2
3	3
4	24
5	50
6	1800
7	5145
8	878080
9	3429216
10	2857680000
11	15219319500
12	63117561830400
13	457937132487120
14	9577928124440387712
15	94609025993497640625
16	10077943267571584204800000

[1,2,3,24,50,1800,5145,878080,3429216,2857680000, 15219319500,63117561830400,457937132487120, 9577928124440387712,94609025993497640625, 10077943267571584204800000]