100330domain: NAppears in sequencesCubes written in base 9.at n=38A004639Column l=4 of irregular triangle in A133709.at n=6A133711Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,1,0,0,0 for x=0,1,2,3,4.at n=16A197469