# A132474 (b-file synthesized from sequence entry) 0 1 1 3 2 6 3 54 4 780 5 16500 6 465240 7 16486512 8 708621480 9 36072738648 10 2137167558432 11 145394086979328 12 11236518532643184 13 977782595316947472 14 95086323023335926048 15 10266902547496839586848 16 1223846872961573356310112