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A075031 as a simple table

na(n)
11
22
320
420
5714
6714
725550
890180
9142803
10809300
1127195648
1227195648
136973441007
1437962822225
1537962822225
16114296059262
17265228019405583
18394047434860662
192493689139940250

[1,2,20,20,714,714,25550,90180,142803,809300,
 27195648,27195648,6973441007,37962822225,
 37962822225,114296059262,265228019405583,
 394047434860662,2493689139940250]