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A284428
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Number of all self-avoiding planar walks of length j (0<=j<=n) starting at (0,0), ending at (n-j,0), remaining in the first quadrant and using steps (0,1), (1,0), (1,1), (-1,1), and (1,-1) with the restriction that (0,1) is never used below the diagonal and (1,0) is never used above the diagonal.
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3
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1, 0, 1, 1, 2, 1, 5, 5, 13, 15, 40, 44, 123, 156, 402, 536, 1361, 1857, 4689, 6681, 16536, 24286, 59400, 89131, 216114, 331324, 796029, 1243168, 2963859, 4700410, 11133792, 17901901, 42155014, 68618679, 160736012, 264497624, 616693942, 1024713750, 2379184108
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OFFSET
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0,5
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LINKS
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CROSSREFS
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KEYWORD
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nonn,walk
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AUTHOR
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STATUS
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approved
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