164150domain: NAppears in sequencesTriangular array read by rows. T(n,k) is the number of functions f:{1,2,...,n}->{1,2,...,n} that have exactly k 3-cycles. n>=0, 0<=k<=floor(n/3).at n=13A185070Number of ways to place 3 points on an n X n X n triangular grid so that no pair of them has distance sqrt(3).at n=12A244501