A transform of the Pell numbers.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =10a(5) =23a(6) =50a(7) =112a(8) =246a(9) =545a(10) =1202a(11) =2658a(12) =5870a(13) =12972a(14) =28656a(15) =63315a(16) =139880a(17) =309049a(18) =682790a(19) =1508527a(20) =3332850a(21) =7363430a(22) =16268356a(23) =35942447a(24) =79409300a(25) =175442668a(26) =387613604a(27) =856372740a(28) =1892023992a(29) =4180136405