Beach-Williams Pell numbers of type k^2 + 1.

Terms

a(0) =2a(1) =226a(2) =2305a(3) =2402a(4) =2705a(5) =3026a(6) =4226a(7) =6242a(8) =6562a(9) =9026a(10) =100001a(11) =10405a(12) =10817a(13) =13226a(14) =14162a(15) =15130a(16) =21016a(17) =21610a(18) =23105a(19) =23717