# A009676 (b-file synthesized from sequence entry) 0 0 1 1 2 -1 3 5 4 -24 5 166 6 -1350 7 13082 8 -145376 9 1827376 10 -25592400 11 395118272 12 -6664254432 13 121895495632 14 -2402856317680 15 50776649007632 16 -1144984530078720 17 27440409496420096 18 -696465326225541888