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A197787 as a simple table

na(n)
11
21
37
464
5859
625741
71390506
8144068133
928038811204
1010322783689890
117158209339360946

[1,1,7,64,859,25741,1390506,144068133,28038811204,
 10322783689890,7158209339360946]