160004domain: NAppears in sequencesa(n) = n^4+4 = (n^2-2*n+2)*(n^2+2*n+2) = ((n-1)^2+1)*((n+1)^2+1).at n=20A057781McKay-Thompson series of class 26B for Monster.at n=43A058597Expansion of q^(-1) * (chi(-q^13) / chi(-q))^2 in powers of q where chi() is a Ramanujan theta function.at n=43A128518a(n) = 16*n^4 + 4.at n=10A222655