The coding-theoretic function A(n,4).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =4a(6) =8a(7) =16a(8) =20a(9) =40a(10) =72a(11) =144a(12) =256a(13) =512a(14) =1024a(15) =2048