# A232985 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 24 5 120 6 720 7 5040 8 40320 9 362880 10 3628800 11 3628800 12 43545600 13 566092800 14 7925299200 15 118879488000 16 1902071808000 17 32335220736000 18 582033973248000 19 11058645491712000 20 221172909834240000 21 4644631106519040000 22 4644631106519040000 23 106826515449937920000 24 2563836370798510080000