3145685

Appears in sequences

• a(n) = 3*(2^n-1) - 2*n.at n=20A050488
• Expansion of (1-x)^(-1)/(1 - x - 2*x^2 + 2*x^3).at n=38A077866
• a(n) = 6*2^n - 2*n - 5.at n=19A142964