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A057552 as a simple table

na(n)
01
15
220
376
4286
51078
64081
715521
859279
9227239
10873885
113370029
1213027729
1350469889
14195892564
15761615284
162965576714
1711563073314
1845141073924
19176423482324
20690215089744
212702831489824
2210593202603774
2341550902139550
24163099562175850
25640650742051802

[1,5,20,76,286,1078,4081,15521,59279,227239,
 873885,3370029,13027729,50469889,195892564,
 761615284,2965576714,11563073314,45141073924,
 176423482324,690215089744,2702831489824,
 10593202603774,41550902139550,163099562175850,
 640650742051802]