# A013001 (b-file synthesized from sequence entry) 0 1 1 -4 2 16 3 -544 4 25344 5 -1920384 6 246359040 7 -39508168704 8 9120978370560 9 -2587275558617088 10 939278027083448320 11 -411971792033339539456 12 217927272725489369743360 13 -135949730585003375068184576