349525

Appears in sequences

• a(2n) = 2*a(2n-1), a(2n+1) = 2*a(2n)+1 (also a(n) is the n-th number without consecutive equal binary digits).at n=19A000975
• Jacobsthal sequence (or Jacobsthal numbers): a(n) = a(n-1) + 2*a(n-2), with a(0) = 0, a(1) = 1; also a(n) = nearest integer to 2^n/3.at n=20A001045
• a(n) = (4^n - 1)/3.at n=10A002450
• a(n) = floor(2^(n-1)/n).at n=23A006788
• Indices of last windows of trapezoidal maps.at n=19A007873
• Number of Barlow packings with group P3(bar)m1(SO) that repeat after 2n-1 layers.at n=20A011950
• Gaussian binomial coefficients [ n,9 ] for q = 4.at n=1A022208
• a(n) = C(n,0) + C(n,3) + ... + C(n,3[n/3]).at n=20A024493
• a(n) = C(n,2) + C(n,5) + ... + C(n, 3*floor(n/3)+2).at n=20A024495
• a(n) = Sum_{k=0..floor(n/2)} A026637(n, k).at n=19A026645
• Numbers n such that number of runs in the base 4 representation of n is congruent to 1 mod 10.at n=27A043868
• Numbers that are repdigits in base 4.at n=28A048329
• Expansion of 1/((1 - x)*(1 - 2*x)*(1 + 2*x)).at n=19A052992
• Expansion of 1/((1 - x)*(1 - 2*x)*(1 + 2*x)).at n=18A052992
• Nearest integer to 2^(n-1)/n.at n=23A054650
• Number of points of period n under the dual of the map x->2x on Z[1/6].at n=19A059990
• Positions of positive coefficients in cyclotomic polynomial Phi_n(x), converted from binary to decimal.at n=38A063696
• 10 X n binary arrays with a path of adjacent 1's from upper left corner to anywhere in right hand column.at n=0A069314
• Numbers of the form (4^{mr}-1)/(4^r-1) for positive integers m, r.at n=23A076275
• Expansion of 1/(1 + x + 2*x^2 + 2*x^3).at n=39A077980