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A158247 as a simple table

na(n)
13
2535
372535
4575272
557352552
6277222353
755257222753
8355252555225
972733233555555
105733237255733523
1153373773323223537
12727753757725325377
1372355332222353337555
14373753523353357733352

[3,535,72535,575272,57352552,277222353,
 55257222753,355252555225,72733233555555,
 5733237255733523,53373773323223537,
 727753757725325377,72355332222353337555,
 373753523353357733352]