-6665domain: ZAppears in sequencesa(n) = (1 - (-6)^n)/7.at n=5A014987Triangle of q-binomial coefficients for q=-6.at n=22A015116Triangle of q-binomial coefficients for q=-6.at n=26A015116Gaussian binomial coefficient [ n,5 ] for q = -6.at n=1A015310Expansion of (eta(q)*eta(q^3))/eta(q^2)^2 in powers of q.at n=41A293306