-360

Appears in sequences

• a(n) = Sum_{d|n, d == 1 mod 4} d^2 - Sum_{d|n, d == 3 mod 4} d^2.at n=37A002173
• a(n) = Sum_{d|n, d == 1 mod 4} d^2 - Sum_{d|n, d == 3 mod 4} d^2.at n=18A002173
• Coefficients in expansion of Eisenstein series E_2 (also called E_1 or G_2).at n=8A006352
• From fundamental unit of Z[ (-n)^{1/4} ].at n=30A006829
• Expansion of 6-dimensional cusp form (eta(q) * eta(q^3))^6 in powers of q.at n=21A007332
• Expansion of e.g.f. cos(tan(x)*sinh(x)), even powers only.at n=3A009079
• Incomplete Gamma Function at -3.at n=7A010843
• Expansion of e.g.f. cos(tan(x)*arcsin(x)) (even powers only).at n=3A012379
• Expansion of e.g.f. sech(tan(x)*arcsin(x)) (only even powers).at n=3A012386
• Expansion of e.g.f. cosh(arctan(x)*sin(x)) (only even powers).at n=3A012429
• Expansion of e.g.f. sec(arctan(x)*sin(x)) (only even powers).at n=3A012430
• Expansion of e.g.f. sech(sinh(x)*tan(x)) (only even powers).at n=3A012553
• Expansion of e.g.f. cosh(arcsinh(x)*arctan(x)) (only even powers).at n=3A012631
• Expansion of e.g.f. sec(arcsinh(x)*arctan(x)) (only even powers).at n=3A012632
• McKay-Thompson series of class 8E for the Monster group.at n=15A029841
• Dirichlet inverse of the Jordan function J_2 (A007434).at n=18A046970
• Reversion of rooted trees A000081.at n=13A050395
• Image of Euler totient function (A000010) under "little Hankel" transform that sends [c_0, c_1, ...] to [d_0, d_1, ...] where d_n = c_n^2 - c_{n+1}*c_{n-1}.at n=26A056228
• McKay-Thompson series of class 22B for Monster.at n=27A058568
• McKay-Thompson series of class 30C for Monster.at n=39A058614