150165

Appears in sequences

• Number of solutions to x^2 + y^2 + z^2 < n^2; number of lattice points inside a sphere of radius n.at n=33A078183
• G.f.: (x-1)/(-2*x^2 + 3*x^3 + 2*x - 1).at n=22A102785
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n), where a(0) = 1, a(1) = 2, b(0) = 3, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=21A295949