89478485

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=27A000975
• 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=28A001045
• a(n) = (4^n - 1)/3.at n=14A002450
• Indices of last windows of trapezoidal maps.at n=27A007873
• a(n) = C(n,0) + C(n,3) + ... + C(n,3[n/3]).at n=28A024493
• a(n) = C(n,1) + C(n,4) + ... + C(n, 3*floor(n/3) + 1).at n=27A024494
• a(n) = Sum_{k=0..floor(n/2)} A026637(n, k).at n=27A026645
• Expansion of 1/((1 - x)*(1 - 2*x)*(1 + 2*x)).at n=26A052992
• Expansion of 1/((1 - x)*(1 - 2*x)*(1 + 2*x)).at n=27A052992
• Number of points of period n under the dual of the map x->2x on Z[1/6].at n=27A059990
• 14 X n binary arrays with a path of adjacent 1's from upper left corner to anywhere in right hand column.at n=0A069318
• List of codewords in binary lexicode with Hamming distance 13 written as decimal numbers.at n=17A075955
• Partial sums of Jacobsthal gap sequence.at n=27A080610
• 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=27A081374
• A Jacobsthal sequence trisection.at n=9A082311
• A Jacobsthal related sequence.at n=6A083228
• Jacobsthal reverse-pair sequence.at n=27A084183
• a(n) is the index of F(n+1) at the unique occurrence of the ordered pair of reversed consecutive terms (F(n+1),F(n)) in Stern's diatomic sequence A002487, where F(k) denotes the k-th term of the Fibonacci sequence A000045.at n=26A086893
• Generalized mod 3 multiplicative Jacobsthal sequence.at n=28A087462
• Generalized multiplicative Jacobsthal sequence.at n=28A087463