51766

Appears in sequences

• a(n) = binomial(n,0) - binomial(n,2) + binomial(n,4).at n=35A058923
• Triangle read by rows: T(n,k) (0<=k<=n) given by T(n,0)=1, T(n,n) = binomial(2n,n); otherwise T(n,k) = T(n,k-1)+T(n-1,k).at n=62A274292
• Number of noncrossing partitions of an n-set with distinct block sizes.at n=15A361529