2147450880

Appears in sequences

• Number of 2n-bead balanced binary necklaces of fundamental period 2n, equivalent to reversed complement; also Dirichlet convolution of b_n=2^(n-1) with mu(n); also number of components of Mandelbrot set corresponding to Julia sets with an attractive n-cycle.at n=31A000740
• a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3), n > 3, with a(0)=a(1)=a(2)=0, a(3)=1.at n=33A000749
• a(n) = 2^(n-1)*(2^n - (-1)^n).at n=16A003674
• a(n) = 2^(n-1)*(2^n - 1), n >= 0.at n=16A006516
• Dual pairs of integrals arising from reflection coefficients.at n=32A007179
• a(n) = 4^n*(4^n - 1)/2.at n=8A026337
• Number of reversible strings with n beads of 4 colors. If more than 1 bead, not palindromic.at n=15A032087
• Number of elements of GF(2^n) with trace 1 and subtrace 1.at n=33A038521
• Maximum number of distinct functions at the bottom of a Boolean (or Binary) Decision Diagram (or BDD) with negation by pointer complementation.at n=4A040996
• Number of primitive (aperiodic) word structures of length n which contain exactly two different symbols.at n=31A056278
• Largest solution of phi(x) = 2^n.at n=29A058215
• Number of subsets of {2,...,n} such that the product of their elements is congruent to 0 (mod n+1).at n=31A064381
• Position of sqrt(n) in the mapping N2QuQR1 given in A065936.at n=16A065938
• Smallest triangular number with n prime factors (counted with multiplicity).at n=19A075088
• a(n) = A000225(n+3)-A052955(n).at n=28A086652
• Central terms of the rows of the XOR difference triangle of the powers of 2 (A099884) so that a(n) = A099884(n, floor(n/2)).at n=30A099885
• Number of compositions of n with an even number of 1's.at n=33A113979
• Decimal number generated by the binary bits of the n-th generation of the Rule 102 elementary cellular automaton.at n=15A117998
• G.f.: 1/((1-2*x)*(1-2*x^2)).at n=30A122746
• 3-imperfect numbers.at n=28A127726