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A120357 as a simple table

na(n)
02
131
2331
33319
433223
5332191
63321937
733219281
8332192831
93321928097
1033219280951
11332192809589
123321928094941
1333219280948907
14332192809488739
153321928094887411
1633219280948873687
17332192809488736253

[2,31,331,3319,33223,332191,3321937,33219281,
 332192831,3321928097,33219280951,332192809589,
 3321928094941,33219280948907,332192809488739,
 3321928094887411,33219280948873687,
 332192809488736253]