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A064646 as a simple table

na(n)
11
22
37
474
5543
610589
7120009
83420257
94767631
102281311434
11141441308909
1251307141467
133301022547923
14200573000466191
15433638827007904943
16328326540448842314
1731534618884970203647
1813785884222546140694347

[1,2,7,74,543,10589,120009,3420257,4767631,
 2281311434,141441308909,51307141467,3301022547923,
 200573000466191,433638827007904943,
 328326540448842314,31534618884970203647,
 13785884222546140694347]