Triangle generated from Pell polynomials.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =3a(5) =5a(6) =1a(7) =4a(8) =10a(9) =12a(10) =1a(11) =5a(12) =17a(13) =33a(14) =29a(15) =1a(16) =6a(17) =26a(18) =72a(19) =109a(20) =70a(21) =1a(22) =7a(23) =37a(24) =135a(25) =305a(26) =360a(27) =169a(28) =1a(29) =8