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A220361 as a simple table

na(n)
21
37
428
5123
6515
72192
89269
939291
10166396
11704935
122986039
1312649248
1453582777
15226980767
16961505180
174073002563
1817253513691
1973087060144
20309601749709
211311494066355
225555578003196
2323533806098447
2499690802365743
25422297015611968
261788878864731825

[1,7,28,123,515,2192,9269,39291,166396,704935,
 2986039,12649248,53582777,226980767,961505180,
 4073002563,17253513691,73087060144,309601749709,
 1311494066355,5555578003196,23533806098447,
 99690802365743,422297015611968,1788878864731825]