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Search: id:A101162
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| A101162 |
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Row sums of a Chebyshev number triangle. |
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+0
3
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| 1, 3, 6, 14, 40, 131, 471, 1829, 7620, 33902, 160362, 803065, 4241457, 23546969, 137002658, 833225728, 5284731576, 34881786097, 239147833907, 1700114999791, 12512735023124, 95205884573428, 747892058653238, 6058264178225451
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row sums of number triangle A101161.
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FORMULA
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a(n)=sum{k=0..n, if(n=k, 1, 2T(n-k, (k+2)/2))} 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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Cf. A101163.
Sequence in context: A106395 A079003 A099966 this_sequence A059741 A054099 A129090
Adjacent sequences: A101159 A101160 A101161 this_sequence A101163 A101164 A101165
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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 03 2004
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