# A157504 (b-file synthesized from sequence entry) 1 -1 2 -2 3 -7 4 -40 5 -301 6 -2856 7 -32299 8 -416816 9 -5892345 10 -86464000 11 -1177909711 12 -8944121088 13 349846341467 14 29237270702080 15 1585383533246925 16 78578098584541184 17 3843296406581515919 18 190784066705549623296