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A098540 as a simple table

na(n)
01
12
25
317
481
5561
65905
798673
82715025
9126550129
1010211715985
111450856148081
12367849450783633
13168250359224212593
14140078954639877776273
15213886080203739816320113
16602782564524824650717471633

[1,2,5,17,81,561,5905,98673,2715025,126550129,
 10211715985,1450856148081,367849450783633,
 168250359224212593,140078954639877776273,
 213886080203739816320113,
 602782564524824650717471633]