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A089718 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 24
5 1020
6 60120
7 4207140
8 32160568320
9 2718954045547227180
10 207010809050400405050407020207010800
11 22077011088099055044004405505504407702202207701108800
12 24240848401212096960108108060600484800484806060060600484808484024240242408484012120969600

[1,1,2,6,24,1020,60120,4207140,32160568320,
 2718954045547227180,
 207010809050400405050407020207010800,
 22077011088099055044004405505504407702202207701108\
 800,
 24240848401212096960108108060600484800484806060060\
 600484808484024240242408484012120969600]

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Last modified June 13 17:14 EDT 2021. Contains 345008 sequences. (Running on oeis4.)