Number of 1's in all compositions of n+1.

Terms

a(0) =1a(1) =2a(2) =5a(3) =12a(4) =28a(5) =64a(6) =144a(7) =320a(8) =704a(9) =1536a(10) =3328a(11) =7168a(12) =15360a(13) =32768a(14) =69632a(15) =147456a(16) =311296a(17) =655360a(18) =1376256a(19) =2883584a(20) =6029312a(21) =12582912a(22) =26214400a(23) =54525952a(24) =113246208a(25) =234881024a(26) =486539264a(27) =1006632960a(28) =2080374784a(29) =4294967296