66292domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 2, 3, 4, 6 and 9.at n=21A137073Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 4,0,2,0,1,1,1 for x=0,1,2,3,4,5,6.at n=5A203115