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A123763
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Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 2 which is symmetric after a rotation by 180 degrees.
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0
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1, 1, 7, 11, 76, 135, 942, 1812, 12537, 25246, 174019, 362458, 2485725
(list;
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internal format)
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OFFSET
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1,3
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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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STATUS
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approved
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