2000719domain: NAppears in sequencesTriangle of Gaussian binomial coefficients [ n,k ] for q = 18.at n=22A022182Triangle of Gaussian binomial coefficients [ n,k ] for q = 18.at n=26A022182a(n) = 111111 in base n.at n=17A053700a(n) = (18^n-1)/17.at n=6A218721