a(n) = 2^n - 2*n*A000048(n).

Terms

a(0) =1a(1) =0a(2) =0a(3) =2a(4) =0a(5) =2a(6) =4a(7) =2a(8) =0a(9) =8a(10) =4a(11) =2a(12) =16a(13) =2a(14) =4a(15) =38a(16) =0a(17) =2a(18) =64a(19) =2a(20) =16a(21) =134a(22) =4a(23) =2a(24) =256a(25) =32a(26) =4a(27) =512a(28) =16a(29) =2