# A012015 (b-file synthesized from sequence entry) 0 1 1 0 2 -4 3 -192 4 -7600 5 -507136 6 -40159040 7 -4621348864 8 -627047126784 9 -113424912867328 10 -23612736247718912 11 -6196586681702039552 12 -1827473399583593672704 13 -652336666072894806360064