# A366368 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 24 5 120 6 360 7 2520 8 10080 9 30240 10 151200 11 1663200 12 1663200 13 21621600 14 151351200 15 151351200 16 605404800 17 10291881600 18 30875644800 19 586637251200 20 586637251200 21 586637251200 22 6453009763200 23 148419224553600 24 148419224553600 25 742096122768000 26 9647249595984000 27 28941748787952000