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A008380 as a simple table

na(n)
16
250
31176
454792
54251456
6495480960
780990184960
817683570598400
94972664013004800
101750589607352320000
11754268505333719040000
12390464536066453094400000
13239146855253471119933440000

[6,50,1176,54792,4251456,495480960,80990184960,
 17683570598400,4972664013004800,
 1750589607352320000,754268505333719040000,
 390464536066453094400000,
 239146855253471119933440000]