6291457

Appears in sequences

• a(0) = 1; thereafter a(n) = 3*2^(n-1) + 1.at n=22A004119
• Expansion of g.f.: (3+x+2*x^2-2*x^3)/((1-2*x)*(1+x^2)).at n=21A100720
• a(1) = 2, a(2) = 4; a(n) = 2*a(n-1) - 1.at n=22A103204
• a(n) = 3*2^n + 1.at n=21A181565
• a(n) = 6*4^n + 1.at n=10A199116
• a(n) = 3*8^n + 1.at n=7A199494
• a(n) = a(n-1) + 2*a(n-2) with n>1, a(0)=2, a(1)=7.at n=21A201630
• Half the number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having exactly two distinct clockwise edge differences.at n=13A209530
• 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=7A209531
• Numbers of the form 2^k+3 or 3*2^k+1, k >= 2.at n=40A245179
• a(0) = 1, a(n+1) = 2*a(n) + periodic sequence of length 2: repeat [5, -4].at n=21A280173
• a(0) = 3, a(n+1) = 2*a(n) + periodic sequence of length 2: repeat [1, -2].at n=21A280345
• Indices where A354169 is the sum of two consecutive powers of 2.at n=40A354775