# A104672 (b-file synthesized from sequence entry) 0 1 1 50 2 825 3 7700 4 50050 5 252252 6 1051050 7 3775200 8 12033450 9 34763300 10 92470378 11 229265400 12 534952600 13 1183859600 14 2500601400 15 5067885504 16 9898213875 17 18700431750 18 34284124875 19 61160599500 20 106419443130 21 180985447500 22 301393121250 23 492256440000 24 789661372500