# A333445 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 6 5 21 6 6 7 24 8 231 9 90 10 10 11 120 12 3465 13 2160 14 260 15 15 16 720 17 65835 18 71280 19 10920 20 600 21 21 22 5040 23 1514205 24 2993760 25 633360 26 39000 27 1197 28 28 29 40320 30 40883535 31 152681760 32 46868640 33 3510000 34 111321 35 2156 36 36 37 362880 38 1267389585 39 9160905600 40 4218177600