74882domain: NAppears in sequencesFrom a nim-like game.at n=42A003413Number of triples (a, b, c) with gcd(a, b, c) = 1 and -n <= a,b,c <= n.at n=22A175549Number of tilings of an 8 X n rectangle using 2*n copies of the disconnected shape [oo__oo].at n=21A323352