27902803969
domain: N
Appears in sequences
- Expansion of -(4*x + sqrt(1-8*x) - 1)/(sqrt(1-8*x)*(4*x^2+x) + 8*x^2 - x).at n=12A240721
- a(n) = Sum_{k=0..floor((n-1)/2)} binomial(n,k)*binomial(n-1-k,floor((n-1)/2) - k).at n=25A359066
- a(2*n) = Sum_{k=0..n-1} binomial(2*n,k) binomial(2*n-1-k, n-1-k). a(2*n+1) = (Sum_{k=0..n} binomial(2*n+1,k) binomial(2*n-k, n-k)) - binomial(2*n-1, n).at n=25A359067