# A332539 (b-file synthesized from sequence entry) 0 2 1 4 2 24 3 432 4 120 5 8640 6 24192 7 313600 8 2073600 9 78382080 10 532224000 11 2212987392000 12 237758976000 13 135998134272000 14 33798352896000 15 28245766348800000 16 17072996548608000 17 9142589651779584000 18 3606419447414784000 19 16427702944441958400000 20 177473799122780160000