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A028225 as a simple table

na(n)
01
137
2860
316070
4263991
53983007
656583850
7768771040
810093501781
9129000877577
101613435099640
1119826334683610
12240097655804371
132872253241385747
1434007147715912230
15399112139110865780

[1,37,860,16070,263991,3983007,56583850,768771040,
 10093501781,129000877577,1613435099640,
 19826334683610,240097655804371,2872253241385747,
 34007147715912230,399112139110865780]