Number of compositions (ordered partitions) of n into distinct parts not greater than n/2.

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =6a(7) =0a(8) =6a(9) =6a(10) =36a(11) =30a(12) =66a(13) =60a(14) =120a(15) =234a(16) =318a(17) =432a(18) =666a(19) =894a(20) =1272a(21) =2226a(22) =2772a(23) =3960a(24) =5496a(25) =7524a(26) =10068a(27) =13776a(28) =22488a(29) =27756