The number of ordered ways to achieve a score of n in darts.

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =17a(5) =40a(6) =98a(7) =233a(8) =562a(9) =1349a(10) =3243a(11) =7789a(12) =18722a(13) =44978a(14) =108083a(15) =259700a(16) =624027a(17) =1499427a(18) =3602913a(19) =8657216a(20) =20801982a(21) =49983920a(22) =120103675a(23) =288590527a(24) =693438537a(25) =1666225599a(26) =4003682857a(27) =9620231375a(28) =23115930197a(29) =55544009564