-1300

Appears in sequences

• Dirichlet inverse of sigma_2 function (A001157).at n=29A053822
• McKay-Thompson series of class 24c for the Monster group.at n=55A062243
• Expansion of (1-x)^(-1)/(1-2*x+2*x^2+x^3).at n=15A077861
• Coefficient triangle of numerator polynomials appearing in certain column o.g.f.s related to the H-atom spectrum.at n=27A120078
• Expansion of q^(-3/4) * eta(q)^2 * eta(q^2)^4 * eta(q^8)^4 / eta(q^4)^6 in powers of q.at n=22A135467
• Expansion of phi(-x) * phi(-x^9) / f(-x^6)^2 in powers of x where phi(), f() are Ramanujan theta functions.at n=55A261202
• Expansion of f(-x) * f(-x^2)^4 / phi(x^2) in powers of x where phi(), f() are Ramanujan theta functions.at n=37A275372
• a(n) = Sum_{d divides n} (-1)^(d + n/d) * d^2.at n=29A321558
• Dirichlet g.f.: zeta(2*s) / (zeta(s) * zeta(s-2)).at n=29A328639