Number of ordered sequences of coins (each of which has value 1, 2, 5, 10 or 20) which add to n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =9a(6) =15a(7) =26a(8) =44a(9) =75a(10) =129a(11) =220a(12) =377a(13) =644a(14) =1101a(15) =1883a(16) =3219a(17) =5505a(18) =9412a(19) =16093a(20) =27518a(21) =47051a(22) =80453a(23) =137563a(24) =235215a(25) =402188a(26) =687688a(27) =1175860a(28) =2010567a(29) =3437810