349526

Appears in sequences

• a(2*n) = 2*a(2*n-1), a(2*n+1) = 2*a(2*n)-1.at n=20A005578
• a(n) = a(n-1) + 2*a(n-2) with a(0)=0, a(1)=2.at n=19A014113
• a(n) = C(n,1) + C(n,4) + ... + C(n, 3*floor(n/3) + 1).at n=19A024494
• a(n) = (4^n + 2)/3.at n=10A047849
• Expansion of 2*(1-x-x^2)/((1-x)*(1+x)*(1-2*x)).at n=19A052953
• a(n) = ceiling(2^(n-1)/n).at n=23A053637
• Expansion of (1 - x)/((1 + x)*(1 - 2*x)).at n=20A078008
• Expansion of (1-x)/(1+x+2*x^2+2*x^3).at n=40A078052
• a(n)*a(n+3) - a(n+1)*a(n+2) = 2^n, given a(0)=1, a(1)=2, a(2)=2.at n=20A080880
• Size of "uniform" Hamming covers of distance 1, that is, Hamming covers in which all vectors of equal weight are treated the same, included or excluded from the cover together.at n=19A081374
• Generalized multiplicative Jacobsthal sequence.at n=20A087464
• Generalized Jacobsthal sequence.at n=19A087628
• Numbers of the form (4^n + 4^(n-1) + ... + 1) + (n mod 2).at n=8A088556
• Expansion of (1-11x)/((1-x)(1-16x)).at n=5A091881
• Expansion of (1+4x+x^2-10x^3)/((1-x)(1-x-2x^2)).at n=17A093380
• Pair reversal of a Jacobsthal sequence.at n=21A094359
• Expansion of -2*x*(-3-2*x+4*x^2) / ((x-1)*(2*x+1)*(2*x-1)*(1+x)).at n=17A120462
• Jacobsthal numbers(A001045) + 1.at n=20A128209
• a(n+3) = 3*(a(n+2) - a(n+1)) + 2*a(n).at n=20A130707
• a(n)= -3a(n-1) -3a(n-2)-2a(n-3), a(0)=1, a(1)=-2, a(2)=2.at n=20A131562