-13119domain: ZAppears in sequencesa(n) = 3 - 2*3^n.at n=8A165746A symmetrical triangle sequence: T(n, k) = q^k + q^(n-k) - q^n, with q=3.at n=46A176225A symmetrical triangle sequence: T(n, k) = q^k + q^(n-k) - q^n, with q=3.at n=53A176225G.f.: Sum_{n=-oo..+oo} x^n * (1 - 2^n*x^n)^n.at n=9A258936