1571990935

Appears in sequences

• a(n) = C(1,1) + C(3,2) + C(5,3) + ... + C(2*n-1,n).at n=16A079309
• Number of base pyramids in all length n left factors of Dyck paths.at n=34A191790
• a(n) = Sum_{k=1..n-1} ((-1)^(k+n+1)*binomial(k,floor(k/2))).at n=34A332754
• Number of nonempty subsets of {1..n} with median n/2.at n=34A361801
• Number of nonempty subsets of {1..n} with median n/2.at n=35A361801