476905domain: NAppears in sequencesa(n) = floor( binomial(n,8)/9).at n=29A011845a(n) = ceiling(binomial(n,9)/n).at n=29A053733Denominator of Product_{i=1..n} (p_i+1)/(p_i-1). Numerators are in A078559.at n=18A078560Number of nX8 binary arrays without the pattern 0 1 diagonally or vertically.at n=8A188842