69604

Appears in sequences

• a(n) = 1*T(n,2n) + 2*T(n,2n-1) + ... + (2n+1)*T(n,0), T given by A027926.at n=12A027993
• The number of vertices formed by straight line segments mutually connecting all vertices of a semicircular polygon defined in A333642.at n=34A330913