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Search: id:A126966
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| A126966 |
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G.f.: sqrt(1-4*x)/(1-2*x). |
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+0
4
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| 1, 0, -2, -8, -26, -80, -244, -752, -2362, -7584, -24892, -83376, -284324, -984672, -3455144, -12259168, -43908026, -158531392, -576352364, -2107982128, -7750490636, -28629222112, -106190978264, -395347083808, -1476813394916, -5533435084480, -20790762971864, -78316232088032
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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A row of an array that is under investigation.
Hankel transform is 2^n*(-1)^C(n+1,2)=A120617(n). - Paul Barry (pbarry(AT)wit.ie), Feb 08 2008
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FORMULA
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a(n)=-Sum(2^j*binomial(2n-2j,n-j)/(2n-2j-1),j=0..n). - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 25 2007
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MAPLE
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a:=n->-sum(2^j*binomial(2*n-2*j, n-j)/(2*n-2*j-1), j=0..n): seq(a(n), n=0..27); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 25 2007
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CROSSREFS
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Cf. A126967.
Sequence in context: A124721 A024023 A103453 this_sequence A002930 A060410 A128634
Adjacent sequences: A126963 A126964 A126965 this_sequence A126967 A126968 A126969
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KEYWORD
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sign
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AUTHOR
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njas, Mar 22 2007
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