# A012763 (b-file synthesized from sequence entry) 0 1 1 0 2 -1 3 3 4 -18 5 60 6 -60 7 -1890 8 31472 9 -319032 10 2369280 11 -6374280 12 -209401368 13 5594400240 14 -90523285944 15 1016295254520 16 -3922383447232 17 -184920315173888 18 6878045401558272 19 -151394798389814208