# A076257 (b-file synthesized from sequence entry) 0 1 1 -2 2 0 3 6 4 0 5 -2 6 -24 7 0 8 24 9 0 10 120 11 0 12 -240 13 0 14 24 15 -720 16 0 17 2400 18 0 19 -720 20 0 21 5040 22 0 23 -25200 24 0 25 15120 26 0 27 -720 28 -40320 29 0 30 282240 31 0 32 -282240 33 0 34 40320 35 0 36 362880 37 0 38 -3386880 39 0 40 5080320 41 0 42 -1451520 43 0 44 40320 45 -3628800 46 0 47 43545600 48 0 49 -91445760 50 0 51 43545600 52 0