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A139238 as a simple table

na(n)
14
224
396
41920
56144
6122880
7393216
87864320
9528482304
101610612736
11135291469824
122061584302080
136597069766656
14131941395333120
158866461766385664
16567453553048682496
171729382256910270464
18145268109580462718976
192213609288845146193920

[4,24,96,1920,6144,122880,393216,7864320,
 528482304,1610612736,135291469824,2061584302080,
 6597069766656,131941395333120,8866461766385664,
 567453553048682496,1729382256910270464,
 145268109580462718976,2213609288845146193920]