Generalized Pellian with second term of 10.

Terms

a(0) =1a(1) =10a(2) =41a(3) =174a(4) =737a(5) =3122a(6) =13225a(7) =56022a(8) =237313a(9) =1005274a(10) =4258409a(11) =18038910a(12) =76414049a(13) =323695106a(14) =1371194473a(15) =5808472998a(16) =24605086465a(17) =104228818858a(18) =441520361897