A transform of the Pell numbers.

Terms

a(0) =0a(1) =1a(2) =2a(3) =7a(4) =18a(5) =52a(6) =142a(7) =397a(8) =1098a(9) =3051a(10) =8460a(11) =23480a(12) =65140a(13) =180749a(14) =501498a(15) =1391483a(16) =3860822a(17) =10712348a(18) =29722698a(19) =82469313a(20) =228821202a(21) =634892599a(22) =1761587480a(23) =4887741040a(24) =13561638120a(25) =37628431801a(26) =104404708402a(27) =289683694927