A109516 - OEIS

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A109516 as a simple table

n	a(n)
1	1
2	1
3	6
4	45
5	464
6	6000
7	93528
8	1707111
9	35721216
10	843160671
11	22165100000
12	642268811184
13	20339749638144
14	698946255836933
15	25903663544572800
16	1029945249481640625
17	43733528272753917952
18	1975222567881226040760

[1,1,6,45,464,6000,93528,1707111,35721216, 843160671,22165100000,642268811184,20339749638144, 698946255836933,25903663544572800, 1029945249481640625,43733528272753917952, 1975222567881226040760]

[1,1,6,45,464,6000,93528,1707111,35721216,
 843160671,22165100000,642268811184,20339749638144,
 698946255836933,25903663544572800,
 1029945249481640625,43733528272753917952,
 1975222567881226040760]