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Search: id:A145787
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| A145787 |
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Number of times you have to move n cards from one pile to another doing one up, one down, until you obtain the initial sequence. |
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+0
1
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| 1, 2, 2, 3, 3, 6, 6, 4, 4, 6, 6, 10, 10, 14, 14, 5, 5
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Let say you have 3 cards (1 - 2 - 3). You move 1, 2 over 1, 3 below 2. Now you have: (2-1-3). Now you repeat the movement: You move 2, 1 over 2, 3 below 2. Now you have: (1-2-3). The same initial scenario. Total 2 moves. With 4 cards you do it in three moves. For 8 cards you need 4 moves. For 16 cards you need 5 moves. I can assume that for 32 cards I will do it in 6 moves. But for 14 or 15 cards you need 14 moves. I don`t know how to predict how many moves for n cards...
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CROSSREFS
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Sequence in context: A143269 A036817 A116417 this_sequence A096111 A101081 A147795
Adjacent sequences: A145784 A145785 A145786 this_sequence A145788 A145789 A145790
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KEYWORD
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nonn
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AUTHOR
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Hernan Bonsembiante (hernanbon(AT)tutopia.com), Oct 19 2008
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