A sequence a(n) such that a(n+1)^2 - a(n)^2 are perfect squares.

Terms

a(0) =3a(1) =5a(2) =13a(3) =85a(4) =221a(5) =1445a(6) =3757a(7) =24565a(8) =63869a(9) =417605a(10) =1085773a(11) =7099285a(12) =18458141a(13) =120687845a(14) =313788397a(15) =2051693365a(16) =5334402749a(17) =34878787205a(18) =90684846733a(19) =592939382485