# A326483 (b-file synthesized from sequence entry) 0 1 1 -2 2 -4 3 40 4 80 5 -1952 6 -3904 7 177280 8 354560 9 -25866752 10 -51733504 11 5535262720 12 11070525440 13 -1633165156352 14 -3266330312704 15 635421069967360 16 1270842139934720 17 -315212388819402752 18 -630424777638805504 19 194181169538675507200