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Search: id:A119259
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| 1, 3, 17, 111, 769, 5503, 40193, 297727, 2228225, 16807935, 127574017
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OFFSET
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0,2
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COMMENT
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a(n) = A119258(2*n,n).
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FORMULA
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a(n)=sum{k=0..n, C(2n,k)*C(2n-k-1,n-k)};. - Paul Barry (pbarry(AT)wit.ie), Sep 28 2007
a(n)=sum{k=0..n, C(n+k-1,k)2^k}; - Paul Barry (pbarry(AT)wit.ie), Sep 28 2007
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CROSSREFS
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Cf. A005408, A056220, A000225, A000337, A055580, A027608.
Sequence in context: A123772 A103730 A074556 this_sequence A131204 A112111 A074554
Adjacent sequences: A119256 A119257 A119258 this_sequence A119260 A119261 A119262
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 11 2006
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