211900domain: NAppears in sequences2n^4+6n^2+4 = 2(n^2+1)(n^2+2).at n=17A120571Number of (w,x,y,z) with all terms in {1,...,n} and median<mean.at n=26A212135Product, for k <= n, of the squarefree parts of the total number of arrangements of a set with k elements.at n=5A222638a(n) = n*(n + 1)*(n + 2)*(7*n - 5)/12.at n=24A264850