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Search: id:A101163
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| A101163 |
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Diagonal sums of a Chebyshev number triangle. |
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+0
3
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| 1, 2, 3, 5, 10, 24, 64, 182, 542, 1685, 5473, 18594, 66063, 245078, 947057, 3802469, 15826392, 68158314, 303273906, 1392503108, 6590530876, 32117814629, 160998508095, 829301391150, 4385370872477, 23786062734932, 132224164567459
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OFFSET
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0,2
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COMMENT
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Diagonal sums of number triangle A101161.
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FORMULA
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a(n)=sum{k=0..floor(n/2), if(k=n-k, 1, 2T(n-2k, (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. A101162.
Sequence in context: A063253 A099967 A106531 this_sequence A155587 A125658 A001200
Adjacent sequences: A101160 A101161 A101162 this_sequence A101164 A101165 A101166
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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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