# A157399 (b-file synthesized from sequence entry) 1 1 2 1 3 3 4 1 5 9 6 15 7 1 8 45 9 60 10 105 11 1 12 165 13 600 14 525 15 945 16 1 17 855 18 5250 19 6300 20 5670 21 10395 22 1 23 3843 24 39900 25 91875 26 79380 27 72765 28 135135 29 1 30 21819 31 391440 32 1164975 33 1323000 34 1164240 35 1081080 36 2027025 37 1