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Search: id:A065457
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| A065457 |
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Period of the flip-riffle shuffle function on a deck of 2n cards. |
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+0
1
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| 2, 2, 4, 6, 6, 10, 12, 4, 8, 18, 6, 22, 20, 18, 28, 10, 10, 12, 36, 12, 20, 14, 12, 46, 42, 8, 52, 20, 18, 58, 60, 6, 12, 66, 22, 70, 18, 20, 30, 78, 54, 82, 8, 28, 22, 12, 10, 36, 48, 30, 100, 102, 12, 106, 36, 36, 28, 44, 12, 24, 110, 20, 100, 14, 14, 130, 18
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The flip-riffle shuffle is a riffle shuffle but also turns the deck upside down.
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EXAMPLE
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flip-riffle shuffle on 6 cards is [1,2,3,4,5,6] -> [6,3,5,2,4,1]. The period of this function is 4, hence a(3) = 4.
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CROSSREFS
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Equals LCM(A002326(n), 2)
Sequence in context: A137268 A008130 A055388 this_sequence A000784 A092991 A102425
Adjacent sequences: A065454 A065455 A065456 this_sequence A065458 A065459 A065460
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KEYWORD
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nonn
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AUTHOR
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Russ Cox (rsc(AT)swtch.com) Nov 19, 2001
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