23471078400domain: NAppears in sequencesBishops on an n X n board (see Robinson paper for details).at n=25A005633Expansion of e.g.f. 1/((1-x)^2*(1-x^2)).at n=12A052618Number of labeled trees with n nodes and 5 leaves.at n=6A055317a(n) = (4*n + 1)*n!.at n=12A082034