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| 作者：巨大八爪鱼 | |
| 最后回复：巨大八爪鱼 | |
| 最后回复时间：2024-11-24 16:46 |
这个数列的名称叫A000127
Maximal number of regions obtained by joining n points around a circle by straight lines. Also number of regions in 4-space formed by n-1 hyperplanes.
(Formerly M1119 N0427)
