230848domain: NAppears in sequencesRow sums of (signed) triangle A060821 (Hermite polynomials).at n=11A062267Number of 6-step left-handed knight's tours (moves only out two, left one) on an n X n board summed over all starting positions.at n=33A187176a(n) is the number of free convex polyominoes of n cells.at n=15A359661