2781184

Appears in sequences

• a(n) = 2*(a(n-1) + a(n-2)), a(0) = 0, a(1) = 1.at n=16A002605
• For n > 0: a(n) = Sum_{r=0..2^(n-1)-1} binomial(2^n, 2r+1)*3^r.at n=4A084595
• Sylvester dividends for A002605.at n=31A105608
• Expansion of g.f.: x^2*(1 + x - x^2)/(1 - 2*x^2 - 2*x^4).at n=32A160444
• Elements of A160444, pairs of consecutive entries swapped.at n=33A160572