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Search: id:A055834
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A055834 T(2n,n), where T is the array in A055830. +0
2
1, 1, 4, 18, 85, 413, 2044, 10248, 51876, 264550, 1357070, 6994780, 36196706, 187938842, 978599560, 5108177816, 26721644973, 140050505085, 735254208670, 3865837887450, 20353393741065, 107290306033845, 566194674179160 (list; graph; listen)
OFFSET

0,3

FORMULA

a(n) = sum(k=0,n,binomial(n+k-1,n)*binomial(k,n-k)). - Max Alekseyev, Jun 17 2007

CROSSREFS

Sequence in context: A085923 A110166 A046885 this_sequence A079567 A030278 A084847

Adjacent sequences: A055831 A055832 A055833 this_sequence A055835 A055836 A055837

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu), May 28 2000

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.


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