81100domain: NAppears in sequencesNumber of 0..n arrays x(0..3) of 4 elements with nondecreasing average value and 0..n occur with instance counts within one of each other.at n=28A200943n^2 concatenated with (n+1)^2.at n=9A246973Expansion of 1/( 1 - 4 * Sum_{k>=0} x^(3^k) / (1 - x^(3^k)) )^(1/2).at n=8A382368