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A001777 as a simple table

na(n)
51
630
7630
811760
9211680
103810240
1169854400
121317254400
1325686460800
14519437318400
1510908183686400
16237996734976000
175394592659456000
18126980411830272000
193101950060425216000
2078582734864105472000
212062796790182768640000
2256059536297908183040000

[1,30,630,11760,211680,3810240,69854400,
 1317254400,25686460800,519437318400,
 10908183686400,237996734976000,5394592659456000,
 126980411830272000,3101950060425216000,
 78582734864105472000,2062796790182768640000,
 56059536297908183040000]