# A280115 (b-file synthesized from sequence entry) 1 1 2 3 3 12 4 132 5 792 6 33264 7 266112 8 19958400 9 618710400 10 66820723200 11 801848678400 12 1425686950195200 13 19959617302732800 14 4111681164362956800 15 962133392460931891200 16 1057384598314564148428800 17 19032922769662154671718400 18 112313277263776374717810278400