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A006091 as a simple table

na(n)
11
23
325
4253
53121
646651
7823537
816777209
9387420481
109999999991
11285311670601
128916100448245
13302875106592241
1411112006825558003
15437893890380859361
1618446744073709551601
17827240261886336764161
1839346408075296537575407
191978419655660313589123961

[1,3,25,253,3121,46651,823537,16777209,387420481,
 9999999991,285311670601,8916100448245,
 302875106592241,11112006825558003,
 437893890380859361,18446744073709551601,
 827240261886336764161,39346408075296537575407,
 1978419655660313589123961]