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A126987
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Expansion of 1/(1+5*x*c(x)), c(x) the g.f. of Catalan numbers A000108.
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5
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1, -5, 20, -85, 350, -1470, 6090, -25485, 105830, -442150, 1838240, -7673330, 31923220, -133186760, 554325750, -2311919325, 9624918150, -40133290350, 167114005800, -696706389750, 2901470571300, -12094930814100, 50375156502900, -209972720898450, 874600454065500
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OFFSET
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0,2
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COMMENTS
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Hankel transform is (-5)^n.
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LINKS
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Table of n, a(n) for n=0..24.
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FORMULA
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a(n)=Sum_{k, 0<=k<=n}A039599(n,k)*(-6)^k.
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MAPLE
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c:=(1-sqrt(1-4*x))/2/x: ser:=series(1/(1+5*x*c), x=0, 27): seq(coeff(ser, x, n), n=0..24); - Emeric Deutsch, Mar 23 2007
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CROSSREFS
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Sequence in context: A099949 A006231 A069007 * A152185 A152187 A045499
Adjacent sequences: A126984 A126985 A126986 * A126988 A126989 A126990
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KEYWORD
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sign
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AUTHOR
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Philippe DELEHAM, Mar 21 2007
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EXTENSIONS
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More terms from Emeric Deutsch, Mar 23 2007
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STATUS
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approved
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