A141372 - OEIS

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A141372 as a simple table

n	a(n)
1	1
2	1
3	6
4	57
5	684
6	9512
7	146848
8	2455208
9	43764802
10	822963750
11	16203122280
12	332189276516
13	7062047285812
14	155178233311932
15	3515420453148936
16	81936668615592785
17	1961578144170589430
18	48167700575393576406

[1,1,6,57,684,9512,146848,2455208,43764802, 822963750,16203122280,332189276516,7062047285812, 155178233311932,3515420453148936, 81936668615592785,1961578144170589430, 48167700575393576406]