Number of peaks at odd level in all Dyck paths of semilength n that have no ascents and no descents of length 1.

A167636

Number of peaks at odd level in all Dyck paths of semilength n that have no ascents and no descents of length 1.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =0a(5) =5a(6) =4a(7) =23a(8) =36a(9) =123a(10) =252a(11) =720a(12) =1664a(13) =4427a(14) =10804a(15) =27971a(16) =69972a(17) =179469a(18) =454300a(19) =1162529a(20) =2961056a(21) =7579620a(22) =19376728a(23) =49659406a(24) =127263208a(25) =326610827a(26) =838550920a(27) =2154985059a(28) =5540935616a(29) =14257159799

External references