# A333772 (b-file synthesized from sequence entry) 1 2 2 32 3 864 4 36864 5 2304000 6 199065600 7 22759833600 8 3329438515200 9 606790169395200 10 134842259865600000 11 35895009576222720000 12 11277559372311429120000 13 4129466323494701629440000 14 1743270091026070964797440000 15 840505222458998500884480000000