Number of compositions of n with exactly 4 transitions between different parts.

Terms

a(0) =1a(1) =6a(2) =31a(3) =99a(4) =278a(5) =654a(6) =1390a(7) =2714a(8) =4927a(9) =8531a(10) =13963a(11) =22134a(12) =33767a(13) =50283a(14) =72470a(15) =102891a(16) =142375a(17) =194202a(18) =260093a(19) =343973a(20) =447906a(21) =577636a(22) =735540a(23) =928009a(24) =1159312a(25) =1436145a(26) =1765079a(27) =2152787a(28) =2608321a(29) =3137866