- Temple De Hirsch Sinai is a Reform Jewish congregation with campuses in Seattle and nearby Bellevue, Washington, USA. It was formed as a 1971 merger between the earlier Temple De Hirsch (Seattle, founded 1899) and Temple Sinai (Bellevue, founded 1961) and is the largest Reform congregation in the Pacific Northwest. The old Temple De Hirsch building (or Old Sanctuary) was listed on the National Register of Historic Places, but was demolished in 1993. Part of the façade remains.
- Catalan number (Wikipedia)
In combinatorial mathematics, the Catalan numbers are a sequence of natural numbers that occur in various counting problems, often involving recursively defined objects. They are named after the French-Belgian mathematician Eugène Charles Catalan.
