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A121517 as a simple table

na(n)
01
11
27
331
4151
5721
63457
716561
879351
9380191
101821607
118727841
1241817601
13200360161
14959983207
154599555871
1622037796151
17105589424881
18505909328257
192423957216401
2011613876753751
2155645426552351
22266613256008007

[1,1,7,31,151,721,3457,16561,79351,380191,1821607,
 8727841,41817601,200360161,959983207,4599555871,
 22037796151,105589424881,505909328257,
 2423957216401,11613876753751,55645426552351,
 266613256008007]