# A273018 (b-file synthesized from sequence entry) 1 84 2 168 3 336 4 420 5 504 6 630 7 672 8 840 9 1260 10 1680 11 2520 12 3360 13 3780 14 4200 15 5040 16 7560 17 10080 18 12600 19 15120 20 20160 21 25200 22 30240 23 37800 24 40320 25 45360 26 50400 27 75600 28 151200