# A142156 (b-file synthesized from sequence entry) 0 1 1 1 2 -1 3 2 4 -1 5 -1 6 6 7 -2 8 -1 9 -3 10 24 11 -6 12 -2 13 -3 14 -13 15 120 16 -24 17 -6 18 -6 19 -13 20 -71 21 720 22 -120 23 -24 24 -18 25 -26 26 -71 27 -461 28 5040 29 -720 30 -120 31 -72 32 -78 33 -142 34 -461 35 -3447 36 40320 37 -5040 38 -720 39 -360 40 -312 41 -426 42 -922 43 -3447 44 -29093 45 362880 46 -40320 47 -5040 48 -2160 49 -1560