# A100648 (b-file synthesized from sequence entry) 3 8 4 45 5 144 6 105 7 17280 8 14175 9 5600 10 12474 11 1935360 12 1576575 13 28740096000 14 156370500 15 688816128 16 97692469875 17 26900729856000 18 158428270000 19 32593902501888000 20 3430178002251 21 1798063128576000 22 988320969417600 23 809280523999877529600000 24 461635966995328125