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A047709 as a simple table

na(n)
10
20
31
40
512
64
7129
872
91332
10960
1113419
1211372
13132900
14126396
151299851
161349784
1712592440
1814023944
19121074183
20142818336
211157026804
221432470300
2311001347199
2414196860272
25104161648860
26139351826712
27982653092725
281357030991292
299241395939636

[0,0,1,0,12,4,129,72,1332,960,13419,11372,132900,
 126396,1299851,1349784,12592440,14023944,
 121074183,142818336,1157026804,1432470300,
 11001347199,14196860272,104161648860,139351826712,
 982653092725,1357030991292,9241395939636]