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A002051 as a simple table

na(n)
10
20
31
49
567
6525
74651
847229
9545707
107087005
11102247051
121622631549
1328091565547
14526858344285
1510641342962251
16230283190961469
175315654681948587
18130370767029070365
193385534663256714251
2092801587319328148989
212677687796244383678827
2281124824998504072833245
232574844419803190382447051

[0,0,1,9,67,525,4651,47229,545707,7087005,
 102247051,1622631549,28091565547,526858344285,
 10641342962251,230283190961469,5315654681948587,
 130370767029070365,3385534663256714251,
 92801587319328148989,2677687796244383678827,
 81124824998504072833245,2574844419803190382447051]