Number of compositions of 5*n-2 into parts 4 and 5.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =10a(5) =16a(6) =29a(7) =64a(8) =156a(9) =376a(10) =860a(11) =1873a(12) =3965a(13) =8347a(14) =17751a(15) =38303a(16) =83488a(17) =182497a(18) =397978a(19) =864339a(20) =1871236a(21) =4046070a(22) =8751965a(23) =18952107a(24) =41080980a(25) =89090436a(26) =193201660a(27) =418857277a(28) =907802332a(29) =1967174726