80030domain: NAppears in sequencesNumber of nonnegative integer 3 X 3 matrices with sum of elements equal to n, up to rotational symmetry.at n=14A054771Place a(n) blue and b(n) (A180002) red balls in an urn, draw 5 balls without replacement; Probability(5 red balls) = Probability(3 red and 2 blue balls).at n=10A180003