Pell companion numbers A001333 without last digit.

Terms

a(0) =1a(1) =4a(2) =9a(3) =23a(4) =57a(5) =139a(6) =336a(7) =811a(8) =1960a(9) =4732a(10) =11424a(11) =27580a(12) =66585a(13) =160752a(14) =388089a(15) =936931a(16) =2261953a(17) =5460839a(18) =13183632a(19) =31828103a(20) =76839840a(21) =185507784a(22) =447855408a(23) =1081218600a(24) =2610292609a(25) =6301803820a(26) =15213900249a(27) =36729604319a(28) =88673108889a(29) =214075822099