# A194770 (b-file synthesized from sequence entry) 1 1 2 -1 3 0 4 6 5 -24 6 0 7 720 8 -5040 9 0 10 362880 11 -3628800 12 0 13 479001600 14 -6227020800 15 0 16 1307674368000 17 -20922789888000 18 0 19 6402373705728000 20 -121645100408832000 21 0 22 51090942171709440000 23 -1124000727777607680000