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A034010
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Number of 2n-step self avoiding closed walks on square grid, restricted to a quadrant and passing through origin.
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4
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0, 1, 2, 6, 20, 74, 300, 1302, 5944, 28266, 139010, 703102, 3641956, 19255106, 103630920, 566522778, 3140130354, 17620845976, 99977635264, 572935630884, 3313078283974
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OFFSET
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1,3
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LINKS
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EXAMPLE
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When the number of steps is 8, one of the six closed paths is
0___.
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CROSSREFS
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KEYWORD
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nonn,hard,walk
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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