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A005976 as a simple table

na(n)
11
21
32
45
515
656
7250
81328
98069
1054962
11410330
123317302
1328774874
14266242936
152616100423
1627205605275
17298569256590
183449309394415
1941854968275924
20532353636671777
217083840662453415
2298443312509634266
231426382369328881332

[1,1,2,5,15,56,250,1328,8069,54962,410330,3317302,
 28774874,266242936,2616100423,27205605275,
 298569256590,3449309394415,41854968275924,
 532353636671777,7083840662453415,
 98443312509634266,1426382369328881332]