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A035520 as a simple table

na(n)
10
20
30
41
530
6705
715960
8370125
98998290
10231416325
116314962500
12182894567625
135615811951750
14182497749258825
156264206330382000
16226636350724909125
178624703350821808250
18344535241891693978125
1914419858385821910521500

[0,0,0,1,30,705,15960,370125,8998290,231416325,
 6314962500,182894567625,5615811951750,
 182497749258825,6264206330382000,
 226636350724909125,8624703350821808250,
 344535241891693978125,14419858385821910521500]