9-distance Pell numbers.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =3a(10) =3a(11) =5a(12) =5a(13) =7a(14) =7a(15) =9a(16) =9a(17) =11a(18) =15a(19) =17a(20) =25a(21) =27a(22) =39a(23) =41a(24) =57a(25) =59a(26) =79a(27) =89a(28) =113a(29) =139