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A159720 as a simple table

na(n)
10
20
30
40
50
640272
762954948
824342647424
95320007368884
10848044852469680
11111078667024032048
1212769013592631944576
131340902091662029846456
14132008300342568131914656
1512398363733385845967412220
161124539850663707285433353472
1799357839137277548804214431980

[0,0,0,0,0,40272,62954948,24342647424,
 5320007368884,848044852469680,111078667024032048,
 12769013592631944576,1340902091662029846456,
 132008300342568131914656,
 12398363733385845967412220,
 1124539850663707285433353472,
 99357839137277548804214431980]