a(n) = A014486(A179754(n)).

Terms

a(0) =50a(1) =216a(2) =868a(3) =3492a(4) =13976a(5) =56472a(6) =225880a(7) =897624a(8) =3590576a(9) =14471600a(10) =57886120a(11) =229868968a(12) =919477136a(13) =3706264464a(14) =14825053488a(15) =58832739632a(16) =235330977088a(17) =948740144448