# A181231 (b-file synthesized from sequence entry) 1 2 2 24 3 1608 4 483840 5 595506240 6 2881362718080 7 53971723989630720 8 3905883638351009925120 9 1097181147335459123569766400 10 1204583321001156830831556548812800 11 5203385513364984367494095906614850764800 12 88913167483454945080054825759528983277687603200