170704domain: NAppears in sequencesNumbers k such that the period of the continued fraction for sqrt(k) contains exactly 67 ones.at n=13A031835Number of overcompositions of n.at n=15A236002Irregular triangle read by rows: T(n,i) = number of n X n semi-canonical binary matrices with exactly i 1's, where 0 <= i <= n^2.at n=81A268523