According to Jerry Birl's fine book on A.C. roulettes ...
"numbers 1,2,3,4,5,6,7,8,10,11,12,14,15,and 16 are used on tables in Bally's Park Place. Numbers 17, 18, 19, 20, 21, and 22 are used in the Wild Wild West Casino. Numbers 9 and 13 are not used at either casino."

Since Jerry's book was published, Park Place #23, #24 and #25 have recently replaced the now obsolete Claridge roulettes ... which are no longer in play.