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A066979 as a simple table

na(n)
10
20
30
41
53
611
739
8157
9708
103543
1119490
12116943
13760134
145320940
1539907054
16319256437
172713679718
1824423117468
19232019615953
202320196159531
2124362059675078
22267982656425859
233081800548897382
2436981606586768593

[0,0,0,1,3,11,39,157,708,3543,19490,116943,760134,
 5320940,39907054,319256437,2713679718,24423117468,
 232019615953,2320196159531,24362059675078,
 267982656425859,3081800548897382,
 36981606586768593]