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A199638 as a simple table

na(n)
45
53
621
713
885
953
10341
11227
121365
13909
145461
153637
1621845
1714563
1887381
1958253
20349525
21233013
221398101
23932067
245592405
253728269
2622369621
2714913077
2889478485
2959652323
30357913941
31238609293
321431655765
33954437173
345726623061
353817748707
3622906492245

[5,3,21,13,85,53,341,227,1365,909,5461,3637,21845,
 14563,87381,58253,349525,233013,1398101,932067,
 5592405,3728269,22369621,14913077,89478485,
 59652323,357913941,238609293,1431655765,954437173,
 5726623061,3817748707,22906492245]