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A303505 as a simple table

na(n)
20
30
40
512
672
7612
83552
934632
10247824
113047544
1226502624
13396071604
144055072664
1571316639036
16839706878016
1716982482829136
18225984627860256
195165674068939696
2076644407669629248
211953726395279874588
2231974794507569558248
23899186672783502993108
2416089847137602083031328

[0,0,0,12,72,612,3552,34632,247824,3047544,
 26502624,396071604,4055072664,71316639036,
 839706878016,16982482829136,225984627860256,
 5165674068939696,76644407669629248,
 1953726395279874588,31974794507569558248,
 899186672783502993108,16089847137602083031328]