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A139397
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Number of pyramids which can be constructed using n 1 x 2 tiles placed on an integral grid, with the base block at a fixed position.
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0
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1, 7, 58, 521, 4906, 47644, 472844, 4768953, 48699382, 502239812, 5221405608, 54645915476, 575131754640, 6082204395960, 64588573227268, 688370635513449
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OFFSET
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0,2
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COMMENTS
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Arises in two-dimensional dimer problem.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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Paul Federbush (PFED(AT)umich.edu), Jun 11 2008
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EXTENSIONS
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Added definition and more terms (computed by Rasmus Mølck Nilsson) submitted by Søren Eilers, Mar 27 2013
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STATUS
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approved
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