# A053495 (b-file synthesized from sequence entry) 0 1 1 1 2 -1 3 -1 4 2 5 -2 6 1 7 -4 8 6 9 -6 10 -1 11 6 12 -18 13 24 14 -24 15 1 16 -9 17 36 18 -96 19 120 20 -120 21 -1 22 12 23 -72 24 240 25 -600 26 720 27 -720 28 1 29 -16 30 120 31 -600 32 1800 33 -4320 34 5040 35 -5040 36 -1 37 20 38 -200 39 1200 40 -5400 41 15120 42 -35280 43 40320 44 -40320 45 1 46 -25 47 300 48 -2400 49 12600