424686

Appears in sequences

• a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = (Lucas numbers).at n=20A024469
• a(n) = Sum_{k=0..n-1} T(n,k)*T(n,2n-k), T given by A027960.at n=10A027980