-7480

Appears in sequences

• E.g.f. A = A(x,y) satisfies: A^2 + B^2 + C^2 = 1 + y^2 and A^3 + B^3 + C^3 = 1 + y^3, where functions B = B(x,y) and C = C(x,y) are described by A278886 and A278887, respectively.at n=49A278885
• Central terms of triangle A278885: a(n) = A278885(n,n+1) = -A278885(n,n) for n>=1.at n=6A278888
• Expansion of 1/(theta_3(q) * theta_3(q^2) * theta_3(q^3)), where theta_3() is the Jacobi theta function.at n=19A320070