# A012779 (b-file synthesized from sequence entry) 0 1 1 0 2 -1 3 3 4 -18 5 60 6 -180 7 -1050 8 24192 9 -308952 10 3131760 11 -23742840 12 62587272 13 2606501040 14 -75839636600 15 1415140435800 16 -20144425867712 17 187207018203392 18 730860552463104 19 -93674690778135744