-402653184

Appears in sequences

• Expansion of (1-x^2)/(1+2x).at n=29A110164
• Expansion of (7+8*x)/(1+2*x).at n=27A176414
• a(n) = 4*a(n-1) - 8*a(n-2) with a(0) = a(1) = 1.at n=19A363092