a(n) = 2^n*A001519(n).

Terms

a(0) =1a(1) =2a(2) =8a(3) =40a(4) =208a(5) =1088a(6) =5696a(7) =29824a(8) =156160a(9) =817664a(10) =4281344a(11) =22417408a(12) =117379072a(13) =614604800a(14) =3218112512a(15) =16850255872a(16) =88229085184a(17) =461973487616