# A012703 (b-file synthesized from sequence entry) 0 0 1 0 2 2 3 -3 4 16 5 -50 6 488 7 -3024 8 35376 9 -313704 10 4119552 11 -46248840 12 682997280 13 -9209575440 14 152505104880 15 -2394128401560 16 44145984906240 17 -789552273397440 18 16082343831221760 19 -322420285049880960