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A231256 as a simple table

na(n)
12
215
3304
419503
53130708
61350570015
71496478177166
84339950773804841
932510127329051575349
10631327524382609726232392
1131694391041907948471880253567

[2,15,304,19503,3130708,1350570015,1496478177166,
 4339950773804841,32510127329051575349,
 631327524382609726232392,
 31694391041907948471880253567]