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A187239 as a simple table

na(n)
10
20
30
40
5440
638368
71022320
814082528
9126490352
10837543200
114412818240
1219447224864
1374255991784
14251997948736
15774861621936
162191005028672
175764306674400
1814243327787456
1933309659739904
2074194554880960
21158241369977880
22324605935279648
23642894402918768

[0,0,0,0,440,38368,1022320,14082528,126490352,
 837543200,4412818240,19447224864,74255991784,
 251997948736,774861621936,2191005028672,
 5764306674400,14243327787456,33309659739904,
 74194554880960,158241369977880,324605935279648,
 642894402918768]