A triangle with Pell numbers in the first column.

Terms

a(0) =1a(1) =2a(2) =1a(3) =5a(4) =3a(5) =1a(6) =12a(7) =10a(8) =4a(9) =1a(10) =29a(11) =30a(12) =16a(13) =5a(14) =1a(15) =70a(16) =87a(17) =56a(18) =23a(19) =6a(20) =1a(21) =169a(22) =245a(23) =185a(24) =91a(25) =31a(26) =7a(27) =1a(28) =408a(29) =676