10986328125domain: NAppears in sequencesReciprocal of n terminates with an infinite repetition of digit 2. Multiples of 10 are omitted.at n=7A064561Number of nX3 array permutations with each element not moved or moved diagonally or antidiagonally by one.at n=14A189274Expansion of g.f. (1+4*x)/(1-5*x).at n=14A270567