174762

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=18A000975
• Barlow packings with group R3(bar)m(SO) that repeat after 6n+3 layers.at n=18A011954
• a(n) = a(n-1) + 2*a(n-2) with a(0)=0, a(1)=2.at n=18A014113
• a(n) = (2/3)*(4^n-1).at n=9A020988
• a(n) = C(n,2) + C(n,5) + ... + C(n, 3*floor(n/3)+2).at n=19A024495
• a(n) = a(n-1) + 2*a(n-2) + 2, for n>=3, where a(0)= 1, a(1)= 2, a(2)= 4.at n=17A026644
• Numbers n such that number of runs in the base 4 representation of n is congruent to 1 mod 9.at n=25A043859
• Numbers n such that number of runs in the base 4 representation of n is congruent to 1 mod 10.at n=25A043868
• Numbers that are repdigits in base 4.at n=26A048329
• Numerator of the expected time to finish a random Tower of Hanoi problem with n disks using optimal moves.at n=18A060590
• Number of 132 and 213-avoiding derangements of {1,2,...,n}.at n=19A061547
• Half totient of 2^n+1.at n=18A063474
• Positions of negative coefficients in cyclotomic polynomial Phi_n(x), converted from binary to decimal. (The constant term in the least significant bit (bit-0), the term x in the next bit (bit-1) and so on).at n=38A063698
• Prime factorization of n+1 encoded with the run lengths of binary expansion.at n=60A075158
• Sequence A075166 interpreted as binary numbers and converted to decimal.at n=22A075165
• Expansion of (1 - x)/((1 + x)*(1 - 2*x)).at n=19A078008
• Expansion of (1-x)/(1+x+2*x^2+2*x^3).at n=35A078052
• a(n) = 2^n - A081374(n).at n=17A083322
• Duplicate of A020988.at n=9A084180
• Partial sums of a Jacobsthal related sequence.at n=18A084184