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Search: id:A126982
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| A126982 |
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Expansion of 1/(1+3*x*c(x)), c(x) the g.f. of Catalan numbers A000108. |
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+0
6
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| 1, -3, 6, -15, 30, -78, 144, -423, 630, -2490, 1956, -16998, -5844, -142860, -235740, -1475415, -3951450, -17627490, -57571740, -228692610, -810889020, -3098590020, -11377872720, -43011709110, -160518364740, -606261789828
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OFFSET
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0,2
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COMMENT
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Hankel transform is (-3)^n.
Catalan transform of the sequence (-1)^n*A000244(n). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 11 2008]
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FORMULA
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a(n)=Sum_{k, 0<=k<=n}A039599(n,k)*(-4)^k.
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CROSSREFS
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Sequence in context: A077449 A152232 A141023 this_sequence A034739 A097941 A117161
Adjacent sequences: A126979 A126980 A126981 this_sequence A126983 A126984 A126985
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KEYWORD
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sign
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Mar 21 2007
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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 11 2008
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