# A152642 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 24 5 120 6 720 7 5040 8 40320 9 335040 10 3012192 11 29176128 12 305154560 13 3438326176 14 41047176736 15 547189186848 16 7724678032040