# A330043 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 24 5 120 6 360 7 2520 8 20160 9 181440 10 907200 11 9979200 12 39916800 13 518918400 14 3632428800 15 18162144000 16 290594304000 17 4940103168000 18 44460928512000 19 844757641728000 20 4223788208640000 21 29566517460480000 22 325231692065280000 23 7480328917501440000 24 59842631340011520000