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Search: id:A056844
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| A056844 |
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Number of polydiamonds: polyominoes made from n diamonds. |
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+0
2
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OFFSET
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1,2
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COMMENT
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Comment from Larry_Reeves(AT)intranetsolutions.com, Jun 22 2001: If you look at Vicher's picture of the 40 4-celled polydiamonds (link in A056844), near the middle of the picture is a polydiamond that looks like the tradiitional 2-D representation of a cube with an extra diamond stuck to the edge. Depending on how you orient the cube, there are actually 2 different ways to form this polydiamond, although there is no change in the perimeter shape. I haven't confirmed that this explains the difference in values for sizes 5 and above for A056844 and A056845, but it looks like a possible explanation.
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LINKS
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M. Vicher, Polyforms
M. Vicher, The 40 4-celled polydiamonds
M. Vicher, The 40 4-celled polydiamonds
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CROSSREFS
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Cf. A056845.
Sequence in context: A166554 A038156 A052846 this_sequence A002825 A052322 A130767
Adjacent sequences: A056841 A056842 A056843 this_sequence A056845 A056846 A056847
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KEYWORD
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nice,nonn
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AUTHOR
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James A. Sellers (sellersj(AT)math.psu.edu), Aug 28 2000
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Jun 21, 2001
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