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A030449 Number of elements in the free band (idempotent semigroup) on n generators. +0
3
1, 6, 159, 332380, 2751884514765, 272622932796281408879065986, 3641839910835401567626683593436003894250931310990279691 (list; graph; listen)
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Last modified December 9 18:50 EST 2009. Contains 170568 sequences.

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