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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]

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Last modified December 11 13:33 EST 2017. Contains 295876 sequences.