Number of compositions (ordered partitions) of n into distinct parts, the least being 3.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =0a(5) =0a(6) =0a(7) =2a(8) =2a(9) =2a(10) =2a(11) =2a(12) =8a(13) =8a(14) =14a(15) =14a(16) =20a(17) =20a(18) =50a(19) =50a(20) =80a(21) =104a(22) =134a(23) =158a(24) =212a(25) =356a(26) =410a(27) =578a(28) =752a(29) =1040