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A339622 as a simple table

na(n)
21
3498
426499
51475286
6100766213
76523266332
8418172485806
926971800950170
101738936046774850
11112060168171247368
127222422644817870197
13465494892350086836970
1430001329862709920944426
151933604967243463575726934
16124622105764386987040047037
178031972575008760516889720476

[1,498,26499,1475286,100766213,6523266332,
 418172485806,26971800950170,1738936046774850,
 112060168171247368,7222422644817870197,
 465494892350086836970,30001329862709920944426,
 1933604967243463575726934,
 124622105764386987040047037,
 8031972575008760516889720476]