# A375989 (b-file synthesized from sequence entry) 0 1 1 -5 2 5 3 30 4 180 5 1410 6 14790 7 203880 8 3559560 9 75659760 10 1893764160 11 54430097760 12 1763357958000 13 63501756552720 14 2514747808468080 15 108572621062573440 16 5074353268651935360 17 255201626973301102080 18 13740802156877800538880 19 788580746923723472839680