# A180896 (b-file synthesized from sequence entry) 1 1 2 0 3 2 4 6 5 30 6 180 7 1260 8 10080 9 90720 10 887040 11 9432360 12 107012160 13 1300448160 14 16716051384 15 228160919040 16 3276565988040 17 49664631128706 18 788840324793320