176647domain: NAppears in sequencesNumber of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, southwest or northwest neighbor modulo 3 and the upper left element equal to 0.at n=14A266879Coefficient of x^n in the expansion of ( (1-x+x^2) / (1-x)^3 )^n.at n=7A372410