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A229842 as a simple table

na(n)
13
281
3987
413401
5178311
62381469
731783299
8424240833
95662582239
1075582071565
111008840783171
1213465626160209
13179734091085543
142399022766771749
1532021249796760479
16427407548197383945
175704874525707845543

[3,81,987,13401,178311,2381469,31783299,424240833,
 5662582239,75582071565,1008840783171,
 13465626160209,179734091085543,2399022766771749,
 32021249796760479,427407548197383945,
 5704874525707845543]