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arXiv 1603.01422math.CO
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关于离散dyck路中1-上升数的简短注记

Short note on the number of 1-ascents in dispersed dyck paths

Kairi Kangro, Mozhgan Pourmoradnasseri, Dirk Oliver Theis

摘要:

长度为n的色散戴克路径(DDP)是$N\times N$上从(0,0)到(n,0)的晶格路径,其中允许以下步骤:“上”(x,y)$\to$(x+1,y+1);“下”(x,y)$\to$(x+1,y-1);以及“右”(x,0)$\to$(x+1,0)。DDP中的上升是连续上升步骤的包含方式最大序列。1-ascend是一个上升的步骤组成的正好1。本文给出了Sloane OEIS中所有长度为n的离散Dyck路A191386的1-上升总数的一个闭公式。以前,只有隐式生成函数关系和渐近性是已知的。

英文摘要:

A dispersed Dyck path (DDP) of length n is a lattice path on $N\times N$ from (0,0) to (n,0) in which the following steps are allowed: "up" (x, y) $\to$ (x+1, y+1); "down" (x, y) $\to$ (x+1, y-1); and "right" (x,0) $\to$ (x+1,0). An ascent in a DDP is an inclusion-wise maximal sequence of consecutive up steps. A 1-ascent is an ascent consisting of exactly 1 up step. We give a closed formula for the total number of 1-ascents in all dispersed Dyck paths of length n, A191386 in Sloane's OEIS. Previously, only implicit generating function relations and asymptotics were known.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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