Number of compositions of n into distinct parts with exactly four descents.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =7a(6) =67a(7) =70a(8) =132a(9) =194a(10) =315a(11) =436a(12) =674a(13) =2046a(14) =2401a(15) =3948a(16) =5669a(17) =8582a(18) =11784a(19) =17312a(20) =23187a(21) =47121a(22) =56974a(23) =86078a(24) =116892a(25) =169282a(26) =223496a(27) =316211a(28) =413133a(29) =565423