# A078921 (b-file synthesized from sequence entry) 1 1 2 -1 3 2 4 2 5 -3 6 6 7 -6 8 8 9 -12 10 24 11 24 12 -30 13 40 14 -60 15 120 16 -120 17 144 18 -180 19 240 20 -360 21 720 22 720 23 -840 24 1008 25 -1260 26 1680 27 -2520 28 5040 29 -5040 30 5760 31 -6720 32 8064 33 -10080 34 13440 35 -20160 36 40320 37 40320 38 -45360 39 51840 40 -60480 41 72576 42 -90720 43 120960 44 -181440 45 362880 46 -362880 47 403200 48 -453600 49 518400 50 -604800