33602domain: NAppears in sequencesa(0) = 1, a(n) = 21*n^2 + 2 for n>0.at n=40A010011"INVERT" transform of squares A000290.at n=8A033453a(n) is the number of integer quintuples (a,b,c,d,e) satisfying a system of linear inequalities and congruences specified in the comments.at n=7A384127