A060817 - OEIS

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A060817 as a simple table

n	a(n)
1	1
2	1
3	2
4	24
5	120
6	1440
7	5040
8	40320
9	362880
10	3628800
11	39916800
12	479001600
13	6227020800
14	87178291200
15	1307674368000
16	20922789888000
17	355687428096000
18	6402373705728000
19	121645100408832000
20	2432902008176640000

[1,1,2,24,120,1440,5040,40320,362880,3628800, 39916800,479001600,6227020800,87178291200, 1307674368000,20922789888000,355687428096000, 6402373705728000,121645100408832000, 2432902008176640000]