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A134780
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The square root of A134779.
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1
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1, 2, 1, 2, 1, 3, -1, 6, -7, 19, -33, 73, -146, 311, -652, 1392, -2977, 6420, -13899, 30247, -66078, 144911, -318853, 703768, -1557718, 3456813, -7689531, 17142887, -38296408, 85715645, -192191445, 431647744, -970958480, 2187288804, -4934101775, 11144794835, -25203825094
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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a[n_] := a[n] = Block[{k = a[n - 1] + 2, s = Sum[ a[i]*x^i, {i, 0, n - 1}]}, If[IntegerQ@ Last@ CoefficientList[ Series[ Sqrt[s + k*x^n], {x, 0, n}], x], k, k + 1]]; a[0] = 1; CoefficientList[ Series[ Sqrt[ Sum[ a[i]*x^i, {i, 0, 36}]], {x, 0, 36}], x]
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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