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A028027 as a simple table

na(n)
01
120
2257
32716
425809
5230244
61975009
716524332
8136058417
91108775668
108975764161
1172350153148
12581586939025
134666887733892
1437407122372513
15299621333407564
162398809490126833
1719199738367402516

[1,20,257,2716,25809,230244,1975009,16524332,
 136058417,1108775668,8975764161,72350153148,
 581586939025,4666887733892,37407122372513,
 299621333407564,2398809490126833,
 19199738367402516]