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Search: id:A134920
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| A134920 |
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Expansion of (1-x+sqrt(1-2x+5x^2))/(2(1-x)^2). |
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+0
1
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| 1, 1, 2, 4, 6, 6, 3, 1, 10, 34, 45, -21, -173, -181, 406, 1488, 1050, -4198, -11931, -3989, 43513, 97305, -8008, -438126, -781169, 468631, 4335188, 6065206, -7930890, -42174786, -44121989, 106840385, 402942250, 281085066, -1301476803
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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Hankel transform is 1,1,-2,-2,3,3,-4,4,.... Binomial transform of sequence 1,0,1,0,-1,0,2,0,-5,0,14,.... with generating function (1+sqrt(1+4x^2))/2=1+x^2C(-x^2) where C(x) is the g.f. of A000108.
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CROSSREFS
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Cf. A134389.
Adjacent sequences: A134917 A134918 A134919 this_sequence A134921 A134922 A134923
Sequence in context: A071083 A141765 A010587 this_sequence A011031 A054584 A049041
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KEYWORD
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easy,sign
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Nov 14 2007
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