# A360438 (b-file synthesized from sequence entry) 0 1 1 3 2 15 3 105 4 945 5 10395 6 135135 7 2297295 8 43648605 9 1003917915 10 25097947875 11 727840488375 12 22563055139625 13 834833040166125 14 34228154646811125 15 1471810649812878375 16 69175100541205283625 17 3389579926519058897625 18 179647736105510121574125 19 10599216430225097172873375 20 646552202243730927545275875