# A009343 (b-file synthesized from sequence entry) 0 0 1 1 2 -3 3 10 4 -50 5 340 6 -2888 7 29440 8 -350160 9 4759760 10 -72787488 11 1236761920 12 -23115758720 13 471323145280 14 -10410977045888 15 247656022739200 16 -6312036805140480 17 171600628707334400 18 -4956751714926617088