# A137668 (b-file synthesized from sequence entry) 1 0 2 1 3 0 4 -2 5 0 6 2 7 0 8 24 9 0 10 -40 11 0 12 16 13 0 14 -720 15 0 16 1568 17 0 18 -1120 19 0 20 272 21 0 22 40320 23 0 24 -104704 25 0 26 102144 27 0 28 -45696 29 0 30 7936 31 0 32 -3628800 33 0 34 10720512 35 0 36 -12869120 37 0 38 8042496 39 0 40 -2618880 41 0 42 353792 43 0 44 479001600 45 0 46 -1565051904 47 0 48 2188865536 49 0 50 -1712668672 51 0 52 789854208 53 0 54 -202369024 55 0