1165864domain: NAppears in sequencesExpansion of 1 + 2/(1-2*x-x^3).at n=18A052910Number of n X 4 arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..1 n X 4 array.at n=17A219769