1040384

Appears in sequences

• Number of 2n-bead balanced binary strings of fundamental period 2n, rotationally equivalent to reversed complement, inequivalent to reverse and complement.at n=16A045669
• S-perfect numbers.at n=20A118372
• Numbers whose binary representation is the concatenation of n 1's and 2n-1 digits 0.at n=6A147538
• Number of binary sequences of length n having exactly one conjugate at Hamming distance 2.at n=31A179677
• Numbers of the form 2^r*p with p an odd prime, which are in A181595 but not in A181701.at n=4A181702
• Near-perfect numbers (A181595) of the form m*2^p, where m = 2^(p-1)*(2^p-1) is a perfect number (A000396).at n=3A181710
• Arises in enumerating Huffman codes, compact trees, and sums of unit fractions.at n=22A194632
• Number T(n,k) of endofunctions f on [n] that are self-inverse on [k]; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=38A245348
• Expansion of 1/((1-4*x^2)^(3/2)-2*x*(1-4*x^2)).at n=13A270822
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 430", based on the 5-celled von Neumann neighborhood.at n=20A288197
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 910", based on the 5-celled von Neumann neighborhood.at n=19A290670
• a(n) = 2^n - 2^floor(2n/3).at n=20A291779