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A188768 as a simple table

na(n)
17
249
3240
41103
55357
626564
7130828
8641137
93143331
1015426387
1175714198
12371548402
131823195326
148946675170
1543903164079
16215441286043
171057208843688
185187912250379
1925458023997998
20124927142385391
21613040099740828

[7,49,240,1103,5357,26564,130828,641137,3143331,
 15426387,75714198,371548402,1823195326,8946675170,
 43903164079,215441286043,1057208843688,
 5187912250379,25458023997998,124927142385391,
 613040099740828]