247254

Appears in sequences

• Expansion of g.f.: 1/(1 - 7*x*c(x)), where c(x) is the g.f. for A000108.at n=6A126694
• Smallest area A of Heron triangles with sides (a, b, c) in arithmetic progression of the form b - d(n), b, b + d(n), where d(n) = A091998(n) = 12*n +- 1.at n=33A229098