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A101125
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Row sums of a Chebyshev number triangle.
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1
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1, 1, 1, 4, 13, 49, 233, 1240, 7201, 45521, 311225, 2285116, 17909309, 149080865, 1312597361, 12180044528, 118740086369, 1212695223137, 12942512039697, 144018843991220, 1667526171728525, 20053044685823697, 250043383489271193
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OFFSET
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0,4
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COMMENTS
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Row sums of A101124.
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LINKS
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Table of n, a(n) for n=0..22.
Index entries for sequences related to Chebyshev polynomials.
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FORMULA
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a(n)=sum{k=0..n, if(k<n, T(n-k, k), if(k=n, 1, 0))} where T(n, k)=(n/2)sum{j=0..floor(n/2), C(n-j, j)(-1)^j*(2k)^(n-2j)}.
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CROSSREFS
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Sequence in context: A140660 A149453 A149454 * A056275 A149455 A105968
Adjacent sequences: A101122 A101123 A101124 * A101126 A101127 A101128
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry, Dec 02 2004
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STATUS
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approved
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