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A097171 as a simple table

na(n)
11
21
36
424
5320
63270
755482
8999656
921718440
10544829130
1115130478990
12475440344412
1316294653237876
14613546243029902
1525016884214147490
161100408748640263120
1751948228453097163312
182617775548597611727506
19140364712844785892810646
207975414423897012183673540

[1,1,6,24,320,3270,55482,999656,21718440,
 544829130,15130478990,475440344412,16294653237876,
 613546243029902,25016884214147490,
 1100408748640263120,51948228453097163312,
 2617775548597611727506,140364712844785892810646,
 7975414423897012183673540]