26556

Appears in sequences

• Number of polyiamonds with n cells that tile the plane.at n=16A071332
• Expansion of 1/(Sum_{i>=0} q^(2*i*(i+1))/Product_{j=0..i} (1 - q^(2*j+1))^2).at n=42A294599
• Expansion of ((1 + 16*x)/(1 - 16*x))^(1/16).at n=5A304915
• Place a point on the integer coordinates, up to |n|, along all four axial directions on a Cartesian plane, and then join an infinite straight line between every pair of points: a(n) is the number of finite edges created in the resulting graph.at n=6A386561