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Search: id:A101126
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| A101126 |
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Diagonal sums of a Chebyshev number triangle. |
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+0
2
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| 1, 0, 0, 1, 3, 3, 8, 30, 117, 466, 1960, 8655, 40391, 200085, 1051888, 5844844, 34131049, 208344660, 1324262256, 8743620525, 59891078347, 425216195191, 3126418416440, 23778261543210, 186815245299549, 1513931016854598
(list; graph; listen)
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OFFSET
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0,5
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COMMENT
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Diagonal sums of number triangle A101124.
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LINKS
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Index entries for sequences related to Chebyshev polynomials.
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FORMULA
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a(n)=sum{k=0..floor(n/2), if(k<n-k, T(n-2k, k), if(k=n-k, 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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Adjacent sequences: A101123 A101124 A101125 this_sequence A101127 A101128 A101129
Sequence in context: A049972 A027376 A038068 this_sequence A119006 A109695 A010610
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Dec 02 2004
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