78677domain: NAppears in sequencesNumbers k such that k concatenated with k+3 gives the product of two numbers which differ by 9.at n=3A116182Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.at n=14A146012