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Wikipedia definition
1. Euler numberIn number theory, the Euler numbers are a sequence En of integers defined by the following Taylor series expansion: where cosh t is the hyperbolic cosine. The Euler numbers appear as a special value of the Euler polynomials. The odd-indexed Euler numbers are all zero. The even-indexed ones have alternating signs.
Read “Euler number” on English Wikipedia
Read “オイラー数” on Japanese Wikipedia
Read “Euler number” on DBpedia

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