a(n) = 2^(n-1)*A047240(n).

Terms

a(0) =0a(1) =1a(2) =4a(3) =24a(4) =56a(5) =128a(6) =384a(7) =832a(8) =1792a(9) =4608a(10) =9728a(11) =20480a(12) =49152a(13) =102400a(14) =212992a(15) =491520a(16) =1015808a(17) =2097152a(18) =4718592a(19) =9699328a(20) =19922944a(21) =44040192a(22) =90177536a(23) =184549376a(24) =402653184a(25) =822083584a(26) =1677721600a(27) =3623878656a(28) =7381975040a(29) =15032385536