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A123797
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Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 6 which is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.
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0
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1, 1, 7, 10, 88, 142, 1277, 2193, 19967, 35449, 325809, 593589, 5473435, 10159187, 93929982, 176846933
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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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EXTENSIONS
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STATUS
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approved
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