Duplicate of A023271.

Terms

a(0) =5a(1) =11a(2) =41a(3) =61a(4) =251a(5) =601a(6) =641a(7) =1091a(8) =1481a(9) =1601a(10) =1741a(11) =1861a(12) =2371a(13) =2671a(14) =3301a(15) =3911