297662

Appears in sequences

• Number of Dyck paths with no UUU's and no DDD's, of semilength n and having no UDUD's (U=(1,1), D=(1,-1)).at n=25A166289
• a(n) = Sum_{k=0..n} binomial(n,k)*binomial(n^2+k,k).at n=5A306280
• a(n) = 2*n*Fibonacci(n-2) + (-1)^n + 1.at n=20A309874
• a(n) = Sum_{k=0..n} binomial(n,k) * binomial(5*n+k,k).at n=5A359646