190988domain: NAppears in sequencesNumbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 46.at n=18A031724a(n) = 361*n^2 + 19.at n=23A158592Triangle read by rows: number of permutations of length n that require exactly k removals from the beginning to become heapable.at n=48A390368