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A081545 as a simple table

na(n)
02
15
237
3193
42161
523041
6241921
72903041
855987201
9958003201
1017915904001
11250822656001
125518098432001
13142216445952001
142897001676800001
1590386452316160001
161807729046323200001
1752563198423859200001

[2,5,37,193,2161,23041,241921,2903041,55987201,
 958003201,17915904001,250822656001,5518098432001,
 142216445952001,2897001676800001,
 90386452316160001,1807729046323200001,
 52563198423859200001]