1662805

Appears in sequences

• Interpolation polynomial through n+1 points (0,1), (1,1), ..., (n-1,1) and (n,n) evaluated at 2n.at n=10A237664
• a(n) is the number of n-celled snake polyominoes in the {4,5} tessellation of the hyperbolic plane.at n=16A390196