33662domain: NAppears in sequencesNumbers whose set of base-11 digits is {2,3}.at n=42A032811a(n) = 1 + n + ((n-1)*n^2)/2.at n=41A218152a(n) = floor(M(g(n-1)+1,..,g(n))), where M = harmonic mean and g(n) = n*(n + 1)*(n + 2)*(n + 3)/24.at n=28A227018a(n) = 2 + n^2*floor((n+3)/2) + floor(3*n/2).at n=39A370754