# A135193 (b-file synthesized from sequence entry) 1 180 2 252 3 720 4 1350 5 1800 6 2040 7 2520 8 3324 9 3870 10 5520 11 6552 12 6750 13 7200 14 7812 15 8220 16 8280 17 8964 18 9450 19 10080 20 10098 21 10980 22 12726 23 13500 24 13842 25 14130 26 14670 27 15120 28 15210 29 16170 30 16368 31 18000 32 18018 33 19170 34 19710 35 20040 36 20400 37 20538 38 20790