# A172031 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 3 5 30 6 15 7 70 8 35 9 210 10 105 11 2310 12 1155 13 10010 14 5005 15 30030 16 15015 17 510510 18 255255 19 3233230 20 1616615 21 1939938 22 969969 23 44618574 24 22309287 25 74364290 26 37182145 27 223092870 28 111546435 29 6469693230 30 3234846615 31 66853496710 32 33426748355 33 200560490130