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A081562 as a simple table

na(n)
01
11
23
37
427
591
6423
71807
89747
949651
10303183
111777447
1212072987
1379587691
14593485623
154327497727
1635069154147
17279393234211
182440577314143
1921043100301847
20196825339400427
211822706292362011
2218153886768953543

[1,1,3,7,27,91,423,1807,9747,49651,303183,1777447,
 12072987,79587691,593485623,4327497727,
 35069154147,279393234211,2440577314143,
 21043100301847,196825339400427,1822706292362011,
 18153886768953543]