1507328

Appears in sequences

• First differences of A045623.at n=19A045891
• a(n) = 2^n*(binomial(n,2) + 1).at n=14A052481
• Expansion of (1+3*x+4*x^2)/(1-4*x^2+4*x^4).at n=30A058582
• 17-almost primes (generalization of semiprimes).at n=23A069278
• Numerator of b(n) given by b(1) = 1, b(2) = 2; for n >= 3, b(n) = (-1)^n (2n-1) ((n-2)!!)^2/((n-1)!!)^2, where n!! is the double factorial A006882.at n=11A095159
• Numerators in the fractional coefficients that form the partial quotients of the continued fraction representation of the inverse tangent of 1/x.at n=11A110255
• Numerators in the coefficients that form the even-indexed partial quotients of the continued fraction representation of the inverse tangent of 1/x.at n=5A110259
• a(n) = (3*n+1)*2^n.at n=15A130129
• Numbers with 34 divisors.at n=7A175744
• Numbers that are not the sum of two squares and two fourth powers.at n=29A214891
• Solutions of sigma(sigma(x)) - phi(phi(x)) = 5x.at n=5A246802
• Expansion of x*(5+x+x^2)/(1-2*x).at n=19A248646
• G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..2*n} T(n,k)^2 * x^k] / A(x)^n * x^n/n ), where T(n,k) is the coefficient of x^k in (1 + x + 2*x^2)^n.at n=33A251687
• Numbers of the form 4^k*(8*j+7) that have exactly three partitions into four positive squares.at n=26A274642
• 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 94", based on the 5-celled von Neumann neighborhood.at n=21A285783
• 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 249", based on the 5-celled von Neumann neighborhood.at n=20A287140