Duplicate of A045637.

Terms

a(0) =13a(1) =29a(2) =53a(3) =173a(4) =293a(5) =1373a(6) =2213a(7) =4493a(8) =5333a(9) =9413a(10) =10613a(11) =18773a(12) =26573a(13) =27893