# A145237 (b-file synthesized from sequence entry) 1 1 2 4 3 24 4 216 5 2952 6 61488 7 1957392 8 95392296 9 7125411888 10 816458567400 11 143601085430064 12 38787148664334000 13 16094818374887017440 14 10263152688155204724288 15 10059484565080507620249504