A208654 - OEIS

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A208654 as a simple table

n	a(n)
1	1
2	2
3	18
4	144
5	12000
6	540000
7	388962000
8	108425318400
9	650403212820480
10	1175952237465600000
11	57409367332363200000000
12	691636564481660937216000000
13	270540272566435932512004833280000

[1,2,18,144,12000,540000,388962000,108425318400, 650403212820480,1175952237465600000, 57409367332363200000000, 691636564481660937216000000, 270540272566435932512004833280000]