Number of peaks in all Dyck n-paths after changing each valley to a peak by the transform DU -> UD.

A216318

Number of peaks in all Dyck n-paths after changing each valley to a peak by the transform DU -> UD.

Terms

    a(0) =0a(1) =1a(2) =2a(3) =8a(4) =31a(5) =119a(6) =456a(7) =1749a(8) =6721a(9) =25883a(10) =99892a(11) =386308a(12) =1496782a(13) =5809478a(14) =22584160a(15) =87922215a(16) =342741285a(17) =1337698515a(18) =5226732060a(19) =20442936360a(20) =80031775890a(21) =313585934610

External references