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A319580 as a simple table

n a(n)
1 1
2 3
3 18
4 215
5 3600
6 80136
7 2213036
8 73068543
9 2806959015
10 123002168300
11 6055381161852
12 330885794632536
13 19872950226273053
14 1301261803764756855
15 92259974680854975000
16 7041606755629152575055
17 575638367425376279620662
18 50180725346542105445190603

[1,3,18,215,3600,80136,2213036,73068543,
 2806959015,123002168300,6055381161852,
 330885794632536,19872950226273053,
 1301261803764756855,92259974680854975000,
 7041606755629152575055,575638367425376279620662,
 50180725346542105445190603]

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Last modified December 7 17:41 EST 2019. Contains 329847 sequences. (Running on oeis4.)