Even elements of A080435.

Terms

a(0) =2a(1) =8a(2) =14a(3) =20a(4) =50a(5) =98a(6) =140a(7) =200a(8) =212a(9) =296a(10) =338a(11) =842a(12) =1388a(13) =1514a(14) =2540a(15) =2870a(16) =25958