Leading column of A102416.

Terms

a(0) =2a(1) =2a(2) =4a(3) =16a(4) =28a(5) =56a(6) =108a(7) =216a(8) =424a(9) =848a(10) =1684a(11) =3368a(12) =6712a(13) =13424a(14) =26808a(15) =53616a(16) =107152a(17) =214304a(18) =428460a(19) =856920a(20) =1713544a(21) =3427088