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A005739 as a simple table

n a(n)
1 4
2 16
3 152
4 2680
5 68968
6 2311640
7 95193064
8 4645069336
9 261938616104
10 16756882325464
11 1198897678224232
12 94851206834082200
13 8221740727881348520
14 774839374768829174104
15 78880995816162599086568
16 8626562553228821851608856

[4,16,152,2680,68968,2311640,95193064,4645069336,
 261938616104,16756882325464,1198897678224232,
 94851206834082200,8221740727881348520,
 774839374768829174104,78880995816162599086568,
 8626562553228821851608856]

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Last modified December 5 13:26 EST 2019. Contains 329751 sequences. (Running on oeis4.)