135207800
domain: N
Appears in sequences
- a(n) = (2*n+3)!/(6*n!*(n+1)!).at n=11A002802
- Apéry numbers: n*C(2*n,n).at n=13A005430
- Number of peaks at even level in all symmetric Dyck paths of semilength n+2.at n=25A088662
- a(n) = n * binomial(n-1, floor((n-1)/2)) = n * max_{i=0..n} binomial(n-1, i).at n=26A100071
- a(n) = n!/([(n-1)/2]!*[(n+1)/2]!) for n>0, a(0)=0, and where [ ] = floor.at n=26A212303
- Number of profiles in domino tiling of a 2*n checkboard.at n=26A218073
- Expansion of (1 + 2*x)/(1 + 4*x^2)^(3/2).at n=25A331552