1223339

Appears in sequences

• a(n) = 2*a(n-1) - (-1)^n for n > 0, a(0)=2.at n=19A062092
• A007318^(-1) * A133648.at n=19A133649
• a(n) = (14*4^n + 1)/3.at n=9A206373
• Expansion of (2 + 6*x + 3*x^2 +4*x^3 - 10*x^4)/(1 - x - 4*x^4 + 4*x^5).at n=38A309792