201326593

Appears in sequences

• a(0) = 1; thereafter a(n) = 3*2^(n-1) + 1.at n=27A004119
• a(n) = n*2^(n-1) + 1.at n=24A005183
• a(n) = n*4^n + 1.at n=12A050915
• Expansion of g.f.: (3+x+2*x^2-2*x^3)/((1-2*x)*(1+x^2)).at n=26A100720
• a(1) = 2, a(2) = 4; a(n) = 2*a(n-1) - 1.at n=27A103204
• a(n) = 3*4^n + 1.at n=13A140660
• a(n) = 3*2^n + 1.at n=26A181565
• Half the number of (n+1) X 5 0..2 arrays with every 2 X 2 subblock having exactly two distinct clockwise edge differences.at n=9A209531
• Expansion of Sum_{k>0} (x * (1 + (k * x)^k))^k.at n=15A360733