Number of peaks in the peak plateaux of all Dyck paths of semilength n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =5a(4) =19a(5) =68a(6) =243a(7) =880a(8) =3233a(9) =12021a(10) =45119a(11) =170595a(12) =648787a(13) =2479057a(14) =9509627a(15) =36598497a(16) =141246127a(17) =546433952a(18) =2118424887a(19) =8227983472a(20) =32010173957a(21) =124715628852a(22) =486550020967