1175034domain: NAppears in sequencesNumbers such that 79 'Reverse and Add' steps are needed to reach a palindrome.at n=21A065326Number of nX6 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=10A208011Number of distinct topologies on an n-set that have exactly 8 open sets.at n=8A281776