536870910

Appears in sequences

• a(n) = 2^n - 2.at n=29A000918
• a(n) = 2^(2*n+1) - 2.at n=14A002446
• a(n) = 2*a(n-1) if n odd else 2*a(n-1) + 6.at n=27A014131
• Number of aperiodic binary strings of length n; also number of binary sequences with primitive period n.at n=29A027375
• Row sums of triangle T(m,n) = number of solutions to 1 <= a(1) < a(2) < ... < a(m) <= n, where gcd(a(1), a(2), ..., a(m), n) = 1, in A020921.at n=28A038199
• Number of 2n-bead balanced binary strings of fundamental period 2n, rotationally equivalent to complement.at n=29A045663
• a(1) = 1; for n>1, sum of binomial(n,k) as k runs over RRS(n), the reduced residue system of n.at n=28A056188
• Number of primitive (aperiodic) words of length n which contain exactly two different symbols.at n=28A056267
• a(n) is the closest number to 2^n which is divisible by n.at n=28A082894
• Number of n X n circulant invertible (0,1) matrices over the reals.at n=28A086323
• Number of ways of 3-coloring an annulus consisting of n zones joined like a pearl necklace.at n=28A092297
• Expansion of (1-x+2x^2)/((1-x)*(1-2x)).at n=28A095121
• a(n) = 2^n+(-1)^n-1.at n=29A099430
• A Horadam-Jacobsthal sequence.at n=28A101622
• Number of palindromes (in base 4) below 4^n.at n=27A117863
• a(n) = largest multiple of n which is <= 2^n.at n=28A128092
• Row sums of triangle A134066.at n=27A134067
• a(n) = A135574(n+1) - 2*A135574(n).at n=29A135575
• a(n) = 2^n - (3-(-1)^n)/2.at n=29A141023
• A007318 * A143098.at n=29A143100