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A151538
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Number of 1-sided strip polyedges with n cells.
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4
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1, 2, 6, 14, 40, 102, 284, 752, 2069, 5547, 15134, 40712, 110456, 297066, 802808, 2156378, 5810329, 15584271, 41894990, 112217372, 301115391, 805584175, 2158366236, 5768337730, 15435275815, 41214200699, 110164972820, 293922598172, 784925297952, 2092745480990, 5584229143243
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OFFSET
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1,2
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COMMENTS
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With A001411 as main input and counting the symmetrical shapes separately, higher terms can be computed efficiently (see formula). - Bert Dobbelaere, Jan 07 2019
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LINKS
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Eric Weisstein's World of Mathematics, Polyedge
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FORMULA
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CROSSREFS
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KEYWORD
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nonn,hard
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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