Number of compositions of n such that the smallest part divides every part.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =14a(5) =32a(6) =57a(7) =123a(8) =239a(9) =493a(10) =970a(11) =1997a(12) =3953a(13) =8017a(14) =16024a(15) =32281a(16) =64550a(17) =129742a(18) =259561a(19) =520606a(20) =1041871a(21) =2087177a(22) =4176594a(23) =8362063a(24) =16730862a(25) =33483361a(26) =66987710a(27) =134029333a(28) =268117646a(29) =536373213