# A156088 (b-file synthesized from sequence entry) 0 0 1 -1 2 8 3 -56 4 385 5 -2640 6 18096 7 -124033 8 850136 9 -5826920 10 39938305 11 -273741216 12 1876250208 13 -12860010241 14 88143821480 15 -604146740120 16 4140883359361 17 -28382036775408 18 194533374068496 19 -1333351581704065 20 9138927697859960