| 1, 1, 6, 90, 2520, 16200, 7484400, 681080400, 11675664000, 12504636144000, 2375880867360000, 78404068622880000, 8910391798788480000, 49229914688306352000000, 2658415393168543008000000, 476169110129306674080000000, 4015057936610313875842560000000, 321778214634055154906810880000000
(list; graph; listen)
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