13307111domain: NAppears in sequencesNumber of perfect matchings (or domino tilings) in graph C_{5} X P_{2n}.at n=5A003729Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) = Product_{a=1..n} Product_{b=1..k} (4*sin(a*Pi/(2*n+1))^2 + 4*cos(b*Pi/(2*k+1))^2).at n=38A340476