# A363412 (b-file synthesized from sequence entry) 0 0 1 1 2 3 3 -12 4 -140 5 420 6 13692 7 -23744 8 -2366784 9 126000 10 641927440 11 1306329024 12 -252172135488 13 -1138135788608 14 135593735484480 15 999117715814400 16 -95707279587325952 17 -1013737882826462976 18 85873512374909086464 19 1217682899871358735360 20 -95486742904897158097920