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A052207
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Number of {s(i):i=0..n} such that |s(i)-s(i-1)|=1, i=1..n and s(i)=0 at four values of i, one of which is i=0.
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0
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0, 0, 0, 0, 0, 8, 16, 40, 80, 168, 336, 672, 1344, 2640, 5280, 10296, 20592, 40040, 80080, 155584, 311168, 604656, 1209312, 2351440
(list; graph; refs; listen; history; internal format)
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