57586domain: NAppears in sequencesPartial sums of (1/5)*floor(6^n/7).at n=8A178719Number of n X 2 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, and upper left element zero.at n=10A230800