# A133437 (b-file synthesized from sequence entry) 1 1 2 -2 3 12 4 -6 5 -120 6 120 7 -24 8 1680 9 -2520 10 360 11 720 12 -120 13 -30240 14 60480 15 -20160 16 -20160 17 5040 18 5040 19 -720 20 665280 21 -1663200 22 907200 23 604800 24 -60480 25 -362880 26 -181440 27 20160 28 40320 29 40320 30 -5040 31 -17297280 32 51891840 33 -39916800 34 -19958400 35 6652800 36 19958400 37 6652800 38 -1814400 39 -1814400 40 -3628800 41 -1814400 42 362880 43 362880 44 362880 45 -40320