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Search: id:A080908
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| A080908 |
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a(n) = the sign of r(n), where r(n) is the integer in [ -2n,2n] which is congruent to (2n)! modulo 4n+1 |
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1
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| 0, 1, -1, 1, -1, 0, 0, 1, 0, -1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, -1
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