4th binomial transform of (1,3,0,0,0,0,0,.....).

Terms

a(0) =1a(1) =7a(2) =40a(3) =208a(4) =1024a(5) =4864a(6) =22528a(7) =102400a(8) =458752a(9) =2031616a(10) =8912896a(11) =38797312a(12) =167772160a(13) =721420288a(14) =3087007744a(15) =13153337344a(16) =55834574848a(17) =236223201280a(18) =996432412672