# A322484 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 24 5 30 6 120 7 210 8 840 9 2310 10 7560 11 9240 12 30030 13 83160 14 120120 15 480480 16 1081080 17 1921920 18 2042040 19 8168160 20 18378360 21 32672640 22 38798760 23 155195040 24 349188840 25 620780160 26 892371480 27 3569485920 28 8031343320 29 14277943680 30 25878772920 31 103515091680