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Search: id:A123800
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| A123800 |
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Number of ways to build a contiguous building with n LEGO blocks of size 1x6 on top of a fixed block of the same size so that the builing is flat, i.e. with all blocks in parallel position. |
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+0
1
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| 11, 136, 1991, 30701, 500038, 8346595, 142812582, 2481290457, 43703296703
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The base block is not counted among the n and must be the only block in the bottom layer of the building
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REFERENCES
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M. Abrahamsen and S. Eilers, Efficient counting of LEGO buildings, in preparation
B. Durhuus and S. Eilers, On the entropy of LEGO, arXiv:math.CO/0504039
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LINKS
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S. Eilers, LEGO counts
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CROSSREFS
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Sequence in context: A157773 A024143 A057718 this_sequence A142895 A124079 A003378
Adjacent sequences: A123797 A123798 A123799 this_sequence A123801 A123802 A123803
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KEYWORD
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nonn,hard
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AUTHOR
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Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006
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