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Search: id:A126932
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| 1, 4, 15, 55, 199, 714, 2547, 9048, 32043, 113212, 399265, 1406079, 4946137, 17383162, 61048359, 214270215, 7516918811, 2636004228, 9240836733, 32386215971
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Hankel transform is (-1)^n.
Row sums of the Riordan array ((1-2x)/(1+x+x^2),x/(1+x+x^2))^(-1). [From Paul Barry (pbarry(AT)wit.ie), Nov 06 2008]
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FORMULA
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a(0)=1, a(n+1)=3*a(n)+A059738(n).
G.f: (sqrt(-3x^2-2x+1)-3(3x-1))/(2(21x^2-13x+2)). [From Paul Barry (pbarry(AT)wit.ie), Nov 06 2008]
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CROSSREFS
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Adjacent sequences: A126929 A126930 A126931 this_sequence A126933 A126934 A126935
Sequence in context: A001559 A002311 A102349 this_sequence A094833 A039717 A026013
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KEYWORD
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nonn
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Mar 17 2007
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