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In mathematics and computing, a triangular array of numbers, polynomials, or the like, is a doubly indexed sequence in which each row is only as long as the row's own index. ==Examples== Notable particular examples include these: *The Bell triangle, whose numbers count the partitions of a set in which a given element is the largest singleton〔.〕 * Catalan's triangle, which counts strings of parentheses in which no close parenthesis is unmatched〔.〕 * Euler's triangle, which counts permutations with a given number of ascents〔.〕 * Floyd's triangle, whose entries are all of the integers in order〔.〕 * Hosoya's triangle, based on the Fibonacci numbers〔.〕 * Lozanić's triangle, used in the mathematics of chemical compounds〔.〕 * Narayana triangle, counting strings of balanced parentheses with a given number of distinct nestings〔.〕 * Pascal's triangle, whose entries are the binomial coefficients〔.〕 Triangular arrays of integers in which each row is symmetric and begins and ends with 1 are sometimes called generalized Pascal triangles; examples include Pascal's triangle, the Narayana numbers, and the triangle of Eulerian numbers.〔.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「triangular array」の詳細全文を読む スポンサード リンク
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