Square pyramidal number
- 四角锥数（在数学中，四角锥数，或金字塔数，是一个有形数表示有多少球堆积成一个金字塔）
Square pyramidal number
-
abstract:
In mathematics, a pyramid number, or square pyramidal number, is a figurate number that represents the number of stacked spheres in a pyramid with a square base. Square pyramidal numbers also solve the problem of counting the number of squares in an n × n grid.
以上来源于:
WordNet