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A006773
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Sum of squared spans of 2n-step polygons on square lattice.
(Formerly M3959)
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1
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0, 1, 5, 30, 186, 1164, 7344, 46732, 299604, 1932900, 12537542, 81705782, 534663812, 3511466838, 23136724382, 152888000934, 1012925595468, 6726766841438, 44767880394634, 298522284224824, 1994187071224056, 13343458013982572, 89420609914983270, 600088861692380354, 4032377457462571694, 27129080022839863318, 182726605700552001998
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OFFSET
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1,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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