# A012621 (b-file synthesized from sequence entry) 0 1 1 0 2 -12 3 -120 4 1680 5 367680 6 12095424 7 -560956032 8 -447394871040 9 -8068784621568 10 -1294533276204032 11 6639186363172284416 12 -1043706052752056152064 13 641443809049086939217920