4478554084

Appears in sequences

• Consider the sequence of circles C0, C1, C2, C3 ..., where C0 is a half-circle of radius 1. C1 is the largest circle that fits into C0 and has radius 1/2. C(n+1) is the largest circle that fits inside C0 but outside C(n), etc. Sequence gives the curvatures (reciprocals of the radii) of the circles.at n=13A099938
• Expansion of (1+2*x-2*x^3-3*x^2)/((x-1)*(x+1)*(x^2+2*x-1)).at n=25A100828
• Perfect squares (A000290) that can be expressed as the sum of four consecutive triangular numbers (A000217).at n=6A165518
• Twice A024537.at n=25A182780