Expansion of 1/(1-2x-31x^2)^(1/2).

Terms

a(0) =1a(1) =1a(2) =17a(3) =49a(4) =481a(5) =2081a(6) =16241a(7) =85457a(8) =600769a(9) =3489601a(10) =23391697a(11) =143000177a(12) =938797729a(13) =5897385313a(14) =38397492017a(15) =244866166289