# A339301 (b-file synthesized from sequence entry) 1 1 2 2 3 12 4 108 5 1380 6 22440 7 446040 8 10461360 9 282970800 10 8670594240 11 296850597120 12 11230473925440 13 465262142304960 14 20948652798353280 15 1018583225567107200 16 53190962586022060800 17 2969038807022050963200 18 176410305542414738995200 19 11116489894884127122969600