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A020549 as a simple table

na(n)
02
12
25
337
4577
514401
6518401
725401601
81625702401
9131681894401
1013168189440001
111593350922240001
12229442532802560001
1338775788043632640001
147600054456551997440001
151710012252724199424000001
16437763136697395052544000001

[2,2,5,37,577,14401,518401,25401601,1625702401,
 131681894401,13168189440001,1593350922240001,
 229442532802560001,38775788043632640001,
 7600054456551997440001,1710012252724199424000001,
 437763136697395052544000001]