# A191778 (b-file synthesized from sequence entry) 1 1 2 4 3 24 4 48 5 480 6 960 7 13440 8 26880 9 161280 10 322560 11 7096320 12 14192640 13 369008640 14 738017280 15 1476034560 16 2952069120 17 100370350080 18 200740700160 19 7628146606080 20 15256293212160 21 30512586424320 22 61025172848640 23 2807157951037440 24 5614315902074880 25 56143159020748800