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A030520 as a simple table

na(n)
20
31
45
520
682
7335
81402
95949
1025652
11111963
12494157
132201270
149886034
1544712737
16203489627
17931191850
184282171470
1919778577235
2091715812335
21426824400684
221992828161414
239332192498397
2443821128181652
25206288470970025
26973361629499032
274602638827207605

[0,1,5,20,82,335,1402,5949,25652,111963,494157,
 2201270,9886034,44712737,203489627,931191850,
 4282171470,19778577235,91715812335,426824400684,
 1992828161414,9332192498397,43821128181652,
 206288470970025,973361629499032,4602638827207605]