A177279 - OEIS

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A177279 as a simple table

n	a(n)
0	1
1	1
2	2
3	6
4	24
5	120
6	720
7	5040
8	40320
9	282240
10	1764000
11	10118880
12	54888240
13	289147152
14	1510241892
15	7937250452
16	42396685874
17	228146155304
18	1228995185960
19	6598619633952
20	35220099648960

[1,1,2,6,24,120,720,5040,40320,282240,1764000, 10118880,54888240,289147152,1510241892,7937250452, 42396685874,228146155304,1228995185960, 6598619633952,35220099648960]