# A365182 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 33 4 252 5 2091 6 18319 7 166750 8 1561599 9 14948572 10 145615404 11 1438752770 12 14384289530 13 145248707646 14 1479212551278 15 15175516654760 16 156691764630780 17 1627069871618145 18 16980373299730925 19 178006989972532900 20 1873607777794186000