227239

Appears in sequences

• a(n) = Sum_{k=0..n} C(2k+2,k).at n=9A057552
• a(n) = Sum_{k=0..n} (-1)^(n-k)*binomial(k,floor(k/2)).at n=21A086905
• Number of base pyramids in all length n left factors of Dyck paths.at n=21A191790