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A141344
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Expansion of (2-sqrt(1+4x))/(2-x-sqrt(1+4x)).
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1
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1, 1, 3, 7, 19, 45, 123, 285, 807, 1771, 5407, 10587, 37627, 57619, 279783, 231615, 2307339, -387531, 21769251, -28249347, 235837791, -539858235, 2857845723, -8509970007, 37342507167, -126289733319, 510715973643, -1837291760147
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OFFSET
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0,3
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COMMENTS
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Row sums of A141343. Hankel transform is 2^n.
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LINKS
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FORMULA
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Conjectured to be D-finite with recurrence: 3*(n-1)*a(n) +2*(2*n-11)*a(n-1) +(79-31*n)*a(n-2) +2*(2*n-5)*a(n-3)=0. - R. J. Mathar, Oct 25 2012
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MATHEMATICA
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CoefficientList[Series[(2-Sqrt[1+4x])/(2-x-Sqrt[1+4x]), {x, 0, 30}], x] (* Harvey P. Dale, Jan 14 2013 *)
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CROSSREFS
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KEYWORD
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easy,sign
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AUTHOR
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STATUS
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approved
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