# A269722 (b-file synthesized from sequence entry) 1 1 2 2 3 2 4 6 5 8 6 6 7 24 8 30 9 42 10 24 11 120 12 116 13 216 14 264 15 120 16 720 17 532 18 1002 19 1920 20 1920 21 720 22 5040 23 2848 24 4626 25 11688 26 19200 27 15840 28 5040