# A009804 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 2 4 -16 5 -168 6 -928 7 -880 8 57472 9 897792 10 7304192 11 -4100864 12 -1356949504 13 -27044864000 14 -271226560512 15 1097459304448 16 114089524002816 17 2671773715300352 18 29775666324832256 19 -316640482329755648