56714752

Appears in sequences

• a(n) = 2*(a(n-1) + a(n-2)), a(0) = 0, a(1) = 1.at n=19A002605
• a(n)*a(n+3) - a(n+1)*a(n+2) = 2^n, given a(0)=1, a(1)=1, a(2)=6.at n=18A080879
• a(n) = Sum_{k=0..n} binomial(2n+1, 2k)*3^(n-k).at n=9A102591
• Sylvester cyclotomic numbers for A002605.at n=18A105607
• Expansion of g.f.: x^2*(1 + x - x^2)/(1 - 2*x^2 - 2*x^4).at n=38A160444