# A012236 (b-file synthesized from sequence entry) 0 1 1 -2 2 24 3 -496 4 24192 5 -1246464 6 150408192 7 -12132673536 8 3380973895680 9 -253363927449600 10 217523969745223680 11 4682388187242823680 12 35388810383588767825920 13 8821171867345211810119680