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Search: id:A123792
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| A123792 |
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Number of ways to build a contiguous building with n LEGO blocks of size 1x5 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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| 9, 91, 1089, 13726, 182736, 2493062, 34865595, 495114895, 7127585291
(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: A015585 A109108 A163456 this_sequence A022520 A020236 A068624
Adjacent sequences: A123789 A123790 A123791 this_sequence A123793 A123794 A123795
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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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