A366550 - OEIS

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A366550 as a simple table

n	a(n)
1	2
2	6
3	18
4	54
5	564
6	3512
7	6542
8	564163
9	2063689
10	54400028
11	5586502348
12	252252704148404
13	971269945245201
14	3745011184713964

[2,6,18,54,564,3512,6542,564163,2063689,54400028, 5586502348,252252704148404,971269945245201, 3745011184713964]