Number of Dyck paths of semilength n such that each positive level has exactly eight peaks.

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =1a(9) =0a(10) =0a(11) =0a(12) =0a(13) =0a(14) =0a(15) =0a(16) =0a(17) =9a(18) =315a(19) =3465a(20) =17325a(21) =45045a(22) =63063a(23) =45045a(24) =12870a(25) =0a(26) =81a(27) =6075a(28) =200340a(29) =3835755