Number of Dyck paths of semilength n such that the minimal number of peaks over all positive levels equals three.

A288542

Number of Dyck paths of semilength n such that the minimal number of peaks over all positive levels equals three.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =4a(5) =29a(6) =90a(7) =188a(8) =345a(9) =825a(10) =3089a(11) =13450a(12) =54526a(13) =198846a(14) =668430a(15) =2155731a(16) =6963768a(17) =23265733a(18) =81163559a(19) =292726843a(20) =1073684818a(21) =3953422052a(22) =14517741411a(23) =53096290021a(24) =193719344526a(25) =706944953011

External references