Number of compositions (ordered partitions) of n into distinct parts, the least being 4.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =0a(6) =0a(7) =0a(8) =0a(9) =2a(10) =2a(11) =2a(12) =2a(13) =2a(14) =2a(15) =8a(16) =8a(17) =14a(18) =14a(19) =20a(20) =20a(21) =26a(22) =50a(23) =56a(24) =80a(25) =110a(26) =134a(27) =164a(28) =212a(29) =242