119516189

Appears in sequences

• a(n) = 2*a(n-1) + a(n-2) - a(n-3), with a(0) = a(1) = 0, a(2) = 1.at n=25A006054
• Expansion of g.f.: 1/(1 - 2*x - x^2 + x^3).at n=23A106805