260757900
domain: N
Appears in sequences
- a(n) = (2n+3)!/(n!*(n+2)!).at n=12A000917
- Number of valleys in all left factors of Dyck paths of length n. A valley is a (1,-1)-step followed by a (1,1)-step.at n=28A191522
- Number of turns in all left factors of Dyck paths of length n.at n=27A191527
- a(n) = (n!*m)/(m!*(m+1)!) where m = floor(n/2).at n=27A237884