Number of compositions of 5*n-1 into parts 4 and 5.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =13a(6) =35a(7) =92a(8) =220a(9) =484a(10) =1013a(11) =2092a(12) =4382a(13) =9404a(14) =20552a(15) =45185a(16) =99009a(17) =215481a(18) =466361a(19) =1006897a(20) =2174834a(21) =4705895a(22) =10200142a(23) =22128873a(24) =48009456a(25) =104111224a(26) =225655617a(27) =488945055a(28) =1059372394a(29) =2295532150