51304domain: NAppears in sequencesa(n) = (n+2)*(n+1)*(n^2 + 7*n - 12)/24.at n=30A014309Number of length 3+2 0..n arrays with the medians of every three consecutive terms nondecreasing.at n=8A250142Numbers that are values of the totient function (A002202) but not of the reduced totient function (A002174).at n=18A270265