# A119619 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 3 5 24 6 10 7 720 8 315 9 4480 10 4536 11 3628800 12 11550 13 479001600 14 13899600 15 43051008 16 638512875 17 20922789888000 18 1905904000 19 6402373705728000 20 118794043368 21 68108451840000 22 4535772564960000 23 1124000727777607680000