509444domain: NAppears in sequencesNumber of 0..6 colorings of a 1 X (n+1) array circular in the n+1 direction with new values 0..6 introduced in row major order.at n=10A214188G.f.: Sum_{n>=0} x^n * (1+x)^(n*(n+1)/2) / Product_{k=1..n} (1 + x*(1+x)^k).at n=16A221547