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A039648
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Number of n-step self-avoiding paths on octant grid, starting at octant origin.
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1
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1, 3, 9, 33, 123, 489, 1947, 7977, 32817, 137253, 576993, 2452071, 10468245, 45032733, 194475321, 844608567, 3680153043, 16105438515, 70677344403
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