68190domain: NAppears in sequencesCoordination sequence for A_4 lattice.at n=18A008383Expansion of (1-x)/(1-x-x^3-x^4+x^5).at n=30A052532Number of integer sequences of length n+1 with sum zero and sum of absolute values 36.at n=3A157067Number of lines through at least two points of a centered hexagonal grid of size n.at n=13A241220