# A012676 (b-file synthesized from sequence entry) 0 1 1 2 2 -4 3 -40 4 2704 5 -135392 6 6955456 7 -305645184 8 -7730286336 9 7469091807744 10 -2423718751585280 11 765682386623223808 12 -278356000956737810432 13 126892576689335471251456