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A004389 as a simple table

na(n)
81
972
103160
11109736
123321960
1391962520
142392407864
1559487568920
161429702652400
1733469894423680
18767464189477128
1917307292232623120
20385037822966765800
218470484585302467168
22184606563010558803400
233991697442876739754640
2485733828145510955528212

[1,72,3160,109736,3321960,91962520,2392407864,
 59487568920,1429702652400,33469894423680,
 767464189477128,17307292232623120,
 385037822966765800,8470484585302467168,
 184606563010558803400,3991697442876739754640,
 85733828145510955528212]