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A247266 as a simple table

na(n)
15197
216402517
3467943467
4504990823
5749554913
6857435633
72430292847
84486052491
96659865703
107064402549
117487094821
1213947137657
1321257640067
1430293402527
1579101562571
16155450410033
17169935221879
18440301256711
191010752751093
201086948034657
211265625000037

[5197,16402517,467943467,504990823,749554913,
 857435633,2430292847,4486052491,6659865703,
 7064402549,7487094821,13947137657,21257640067,
 30293402527,79101562571,155450410033,169935221879,
 440301256711,1010752751093,1086948034657,
 1265625000037]