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A258880 as a simple table

na(n)
01
16
2540
3184680
4157600080
5270419925600
6816984611467200
73971317527112003200
829097143353353192480000
9305823675529741700675520000
104435486895868663971869188480000
1186036822683997062842122964537600000
122175352015640142857526698650779456000000

[1,6,540,184680,157600080,270419925600,
 816984611467200,3971317527112003200,
 29097143353353192480000,
 305823675529741700675520000,
 4435486895868663971869188480000,
 86036822683997062842122964537600000,
 2175352015640142857526698650779456000000]