A059357 - OEIS

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A059357 as a simple table

n	a(n)
3	1
4	18
5	215
6	2475
7	28294
8	340116
9	4335596
10	57773700
11	831170736
12	12532005288
13	201002619168
14	3401283910752
15	60929911689984
16	1143429812726400
17	22572470529457920
18	468013463441475840
19	10124124979606179840

[1,18,215,2475,28294,340116,4335596,57773700, 831170736,12532005288,201002619168,3401283910752, 60929911689984,1143429812726400,22572470529457920, 468013463441475840,10124124979606179840]