A158834 - OEIS

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A158834 as a simple table

n	a(n)
1	1
2	4
3	30
4	315
5	4200
6	67620
7	1273668
8	27454218
9	666200106
10	17968302638
11	533188477536
12	17261808531552
13	605452449574320
14	22870569475477112
15	925663441858807096
16	39964465820186753753
17	1833332492818402014474

[1,4,30,315,4200,67620,1273668,27454218,666200106, 17968302638,533188477536,17261808531552, 605452449574320,22870569475477112, 925663441858807096,39964465820186753753, 1833332492818402014474]