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A180284 as a simple table

na(n)
44
520
690
7392
81652
96804
1027600
11110715
12440374
131740024
146838832
1526762645
16104356980
17405706292
181573256772
196087597150
2023511579564
2190659983064
22349090305487
231342531370565
245157512878694
2519794331541270
2675905591609120
27290857683782250
281113774550930080

[4,20,90,392,1652,6804,27600,110715,440374,
 1740024,6838832,26762645,104356980,405706292,
 1573256772,6087597150,23511579564,90659983064,
 349090305487,1342531370565,5157512878694,
 19794331541270,75905591609120,290857683782250,
 1113774550930080]