# A199970 (b-file synthesized from sequence entry) 1 0 2 3 3 4 4 6 5 12 6 0 7 60 8 420 9 840 10 0 11 2520 12 0 13 27720 14 0 15 0 16 360360 17 720720 18 0 19 12252240 20 0 21 0 22 0 23 232792560 24 0 25 5354228880 26 0 27 26771144400 28 0 29 80313433200 30 0 31 2329089562800 32 72201776446800 33 0 34 0 35 0 36 0 37 144403552893600 38 0 39 0 40 0 41 5342931457063200 42 0 43 219060189739591200