# A048980 (b-file synthesized from sequence entry) 0 1 1 1 2 0 3 -6 4 -36 5 -196 6 -724 7 7512 8 366838 9 11928316 10 421130508 11 14598816402 12 584642184936 13 25314953837836 14 1128885572358548 15 54492272309366314 16 2950485568862138250 17 213151926413154110951