4870144

Appears in sequences

• Expansion of (1-4*x)/(1-4*x-4*x^2).at n=11A094013
• Expansion of 4*x/(1 - 4*x - 4*x^2).at n=10A106568
• a(n) = ((4 + sqrt(18))*(4 + sqrt(8))^n + (4 - sqrt(18))*(4 - sqrt(8))^n)/8 .at n=8A164591
• G.f. A(x) satisfies A(x) = ( 1 + 4*x*(1 + x)*A(x) )^(1/2).at n=23A372037