148260domain: NAppears in sequencesa(n) = 4*n*(4*n^2 + 1).at n=21A144965a(n) = 1225*n^2 + 35.at n=11A158733a(n) = 121*n^2 + n.at n=34A173267Number of (w,x,y,z) with all terms in {1,...,n} and w>=2x and y<3z.at n=29A212520