# A173212 (b-file synthesized from sequence entry) 0 1 1 4 2 36 3 1056 4 73200 5 9179640 6 1794887640 7 500614248960 8 187826632116480 9 90939137506660800 10 55080912083696452800 11 40741241351161144147200 12 36096696228114024645542400 13 37707879201499850798028974400