-2320

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=50A002173
• Expansion of Product_{m>=1} (1+q^m)^(-4).at n=19A022599
• McKay-Thompson series of class 15B for Monster.at n=41A058509
• Expansion of (1-x-x^N)/((1-x)(1-x^2)(1-x^3)...(1-x^N)) for N = 9.at n=41A060028
• McKay-Thompson series of class 24f for the Monster group with a(0) = -2.at n=41A093067
• McKay-Thompson series of class 12f for the Monster group.at n=57A112149
• Expansion of q^(-1/2) * (eta(q)^4 * eta(q^4)^2 / eta(q^2)^3)^2 in powers of q.at n=25A138502
• Expansion of ((phi(q) * phi(-q^2)^2)^2 - 1) / 4 in powers of q where phi() is a Ramanujan theta function.at n=50A138505