A080795 - OEIS

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A080795 as a simple table

n	a(n)
0	1
1	1
2	4
3	20
4	128
5	1024
6	9856
7	110720
8	1421312
9	20525056
10	329334784
11	5812797440
12	111923560448
13	2334639652864
14	52444850814976
15	1262260748288000
16	32405895451246592
17	883950436237705216
18	25530268718794276864

[1,1,4,20,128,1024,9856,110720,1421312,20525056, 329334784,5812797440,111923560448,2334639652864, 52444850814976,1262260748288000,32405895451246592, 883950436237705216,25530268718794276864]