Centered square number
- 中心正方形数（中心正方形数是排成正方形的中心多边形数，公式为n + (n - 1)，是2个一般正方形数之和。同时，第n个中心正方数是第n个一般三角形数的4倍加1）
Centered square number
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abstract:
In elementary number theory, a centered square number is a centered figurate number that gives the number of dots in a square with a dot in the center and all other dots surrounding the center dot in successive square layers. That is, each centered square number equals the number of dots within a given city block distance of the center dot on a regular square lattice.
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WordNet