4508102925
domain: N
Appears in sequences
- a(n) = (2n+3)!/(n!*(n+2)!).at n=14A000917
- Coefficient of x^2 in 2n-th normalized Legendre polynomial.at n=14A100259
- 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=32A191522
- Number of turns in all left factors of Dyck paths of length n.at n=31A191527
- a(n) = (n!*m)/(m!*(m+1)!) where m = floor(n/2).at n=31A237884