Number of compositions of 5*n-3 into parts 4 and 5.

Terms

a(0) =0a(1) =0a(2) =1a(3) =4a(4) =10a(5) =20a(6) =36a(7) =65a(8) =129a(9) =285a(10) =661a(11) =1521a(12) =3394a(13) =7359a(14) =15706a(15) =33457a(16) =71760a(17) =155248a(18) =337745a(19) =735723a(20) =1600062a(21) =3471298a(22) =7517368a(23) =16269333a(24) =35221440a(25) =76302420a(26) =165392856a(27) =358594516a(28) =777451793a(29) =1685254125