# A303487 (b-file synthesized from sequence entry) 0 1 1 1 2 12 3 231 4 6144 5 208845 6 8648640 7 422463195 8 23781703680 9 1515973484025 10 107941254220800 11 8491022274509775 12 731304510986649600 13 68444451854354701125 14 6916953288171902976000 15 750681472158682148959875 16 87076954662428278259712000 17 10751175443940144673035200625