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A156027 as a simple table

na(n)
15
231
322621
4837931
53835261
66377551
716007041
830397351
9147753211
10745720141
11987082981
122439903211
133276517921
144178766091
1511468884081
1658714318141
1772695416561
18418374010741
19788251653691
20829180295191
211029317536801
223255573820801
233343706188681

[5,31,22621,837931,3835261,6377551,16007041,
 30397351,147753211,745720141,987082981,2439903211,
 3276517921,4178766091,11468884081,58714318141,
 72695416561,418374010741,788251653691,
 829180295191,1029317536801,3255573820801,
 3343706188681]