177494domain: NAppears in sequencesGraham-Sloane-type lower bound on the size of a ternary (n,3,9) constant-weight code.at n=7A030509a(n) = coefficient of x^n in the power series A(x) such that: x = Sum_{n=-oo..+oo} (-1)^n * x^n * (2 + x^n)^n * A(x)^n.at n=9A357797