Cycle-path coverings of a family of digraphs.

Terms

a(0) =1a(1) =2a(2) =7a(3) =18a(4) =49a(5) =136a(6) =377a(7) =1044a(8) =2891a(9) =8006a(10) =22171a(11) =61398a(12) =170029a(13) =470860a(14) =1303949a(15) =3611016a(16) =9999959a(17) =27692810a(18) =76689487a(19) =212375610a(20) =588130153a(21) =1628704336a(22) =4510358465a(23) =12490501212a(24) =34589849507a(25) =95789405774a(26) =265268869027