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A320743 as a simple table

na(n)
10
20
30
40
50
64
713
846
9144
10420
111221
123474
139856
1427794
1578632
16222156
17629760
181787440
195087797
2014509580
2141479867
22118811286
23341009901
24980488510
252824029648
268146494860
2723534997912
2868084154502
29197211336576
30571915188840
311660405181149
324825559508106
3314038010213051
3440875403561680
35119122661856133
36347441159864556
371014152747485696

[0,0,0,0,0,4,13,46,144,420,1221,3474,9856,27794,
 78632,222156,629760,1787440,5087797,14509580,
 41479867,118811286,341009901,980488510,2824029648,
 8146494860,23534997912,68084154502,197211336576,
 571915188840,1660405181149,4825559508106,
 14038010213051,40875403561680,119122661856133,
 347441159864556,1014152747485696]