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A069948 as a simple table

na(n)
01
15
287
32971
4163121
512962661
61395857215
7194634226067
833990369362241
97247035915622821
101848636684656077991
11555005864462114884875
12193458213840943964983537
1377399534126148191747554181
1435196002960227350045891984591
1518037244723394790042393195636291

[1,5,87,2971,163121,12962661,1395857215,
 194634226067,33990369362241,7247035915622821,
 1848636684656077991,555005864462114884875,
 193458213840943964983537,
 77399534126148191747554181,
 35196002960227350045891984591,
 18037244723394790042393195636291]