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A015251 as a simple table

na(n)
21
37
470
5610
65551
749777
8448540
94035220
1036321901
11326882347
122941985410
1326477735830
14238300021051
152144698993717
1619302294530680
17173720640014440
181563485792415001
1914071372034879887

[1,7,70,610,5551,49777,448540,4035220,36321901,
 326882347,2941985410,26477735830,238300021051,
 2144698993717,19302294530680,173720640014440,
 1563485792415001,14071372034879887]