89478486

Appears in sequences

• a(2*n) = 2*a(2*n-1), a(2*n+1) = 2*a(2*n)-1.at n=28A005578
• a(n) = a(n-1) + 2*a(n-2) with a(0)=0, a(1)=2.at n=27A014113
• a(n) = C(n,2) + C(n,5) + ... + C(n, 3*floor(n/3)+2).at n=28A024495
• a(n) = (4^n + 2)/3.at n=14A047849
• Expansion of 2*(1-x-x^2)/((1-x)*(1+x)*(1-2*x)).at n=27A052953
• a(1) = 1; for n>1, sum of binomial(n,k) as k runs over RRS(n), the reduced residue system of n.at n=26A056188
• Number of integers in {1, 2, ..., 2^n} that are coprime to n.at n=26A074933
• Expansion of (1 - x)/((1 + x)*(1 - 2*x)).at n=28A078008
• 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=28A080880
• a(n) = 2^n - A081374(n).at n=26A083322
• Binomial transform of (-1)^mod(n,3) (A257075).at n=28A086953
• Generalized multiplicative Jacobsthal sequence.at n=28A087464
• Numbers of the form (4^n + 4^(n-1) + ... + 1) + (n mod 2).at n=12A088556
• Expansion of (1-11x)/((1-x)(1-16x)).at n=7A091881
• Expansion of (1+4x+x^2-10x^3)/((1-x)(1-x-2x^2)).at n=25A093380
• Pair reversal of a Jacobsthal sequence.at n=29A094359
• Expansion of -2*x*(-3-2*x+4*x^2) / ((x-1)*(2*x+1)*(2*x-1)*(1+x)).at n=25A120462
• Jacobsthal numbers(A001045) + 1.at n=28A128209
• A trisection of A024495.at n=9A132804
• Row sums of triangle A135230.at n=27A135231