28538domain: NAppears in sequencesNumber of (w,x,y,z) with all terms in {1,...,n} and |x-y| = w + |y-z|.at n=39A212683Coordination sequence for (3,4,4) tiling of hyperbolic plane.at n=20A265075Numbers k such that k * 14^k - 1 is prime.at n=10A299377