22369621

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=25A000975
• 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=26A001045
• a(n) = (4^n - 1)/3.at n=13A002450
• Numerators of coefficients for central differences M_{4}^(2*n).at n=12A002675
• Numerators of the Taylor coefficients of (e^x-1)^2.at n=25A002678
• Divisors of 2^26 - 1.at n=6A003534
• Indices of last windows of trapezoidal maps.at n=25A007873
• Number of Barlow packings with group P3(bar)m1(SO) that repeat after 2n-1 layers.at n=26A011950
• Cyclotomic polynomials at x=4.at n=13A019322
• Cyclotomic polynomials at x=-4.at n=26A020503
• 13th cyclotomic polynomial evaluated at powers of 2.at n=2A020521
• Gaussian binomial coefficients [ n,12 ] for q = 4.at n=1A022211
• a(n) = C(n,0) + C(n,3) + ... + C(n,3[n/3]).at n=26A024493
• a(n) = C(n,2) + C(n,5) + ... + C(n, 3*floor(n/3)+2).at n=26A024495
• a(n) = Sum_{k=0..floor(n/2)} A026637(n, k).at n=25A026645
• Numbers that are repdigits in base 4.at n=37A048329
• Expansion of 1/((1 - x)*(1 - 2*x)*(1 + 2*x)).at n=24A052992
• Expansion of 1/((1 - x)*(1 - 2*x)*(1 + 2*x)).at n=25A052992
• Number of points of period n under the dual of the map x->2x on Z[1/6].at n=25A059990
• a(n) = Sum_{j=0..12} n^j.at n=4A060887