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A112425 as a simple table

na(n)
10
20
30
40
51
63
731
8298
92616
1020346
11140605
12880737
135082279
1427402524
15139587885
16677772953
173158930531
1814212444473
1962009204208
20263350765116
211092085621098
224433596269478

[0,0,0,0,1,3,31,298,2616,20346,140605,880737,
 5082279,27402524,139587885,677772953,3158930531,
 14212444473,62009204208,263350765116,
 1092085621098,4433596269478]