109820domain: NAppears in sequencesNumber of alternating sign 2n+1 X 2n+1 matrices symmetric with respect to both horizontal and vertical axes (VHSASM's).at n=8A005161Numbers n such that n^4 is a sum of 4th powers of four nonzero integers whose sum is n.at n=21A138760a(n) = 4*n*(4*n^2 + 1).at n=19A144965