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A092947 as a simple table

na(n)
13
25
3181
42521
5552553
639070081
74180176001
81483048828801
9672375473078401
10106890247271808001
1140812700642879334401
1237716399337002946560001
1318266163370859189769984001
149553876078552184850831360001

[3,5,181,2521,552553,39070081,4180176001,
 1483048828801,672375473078401,106890247271808001,
 40812700642879334401,37716399337002946560001,
 18266163370859189769984001,
 9553876078552184850831360001]