152082domain: NAppears in sequencesNumber of n X n binary arrays, symmetric under 90-degree rotation, with every 1 adjacent to at least one other 1 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise.at n=12A144243Numbers k such that k^3 - 1 and k^3 + 1 are both semiprimes.at n=15A268043