# A126089 (b-file synthesized from sequence entry) 0 1 1 -4 2 4 3 0 4 -48 5 -960 6 -20160 7 -483840 8 -13305600 9 -415134720 10 -14529715200 11 -564583219200 12 -24135932620800 13 -1126343522304000 14 -56992982228582400 15 -3108708121559040000 16 -181859425111203840000 17 -11359219476176732160000 18 -754576722346025779200000