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Search: id:A160852
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| 1, 2, 11, 66, 461, 3448, 27061, 219702, 1829851, 15547142, 134224361, 1174119120, 10383783641, 92691197962, 834047700091, 7557110252538, 68890745834341, 631392034936040, 5814520777199261, 53776065007163886, 499275423496447211
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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G.f.: (1+x-x^2-sqrt(1-10x-x^2+10x^3+x^4))/(6x(1-x^2));
G.f.: 1/(1-2x-x^2-6x^2/(1-5x-x^2-6x^2/(1-5x-x^2-6x^2/(1-5-x^2-6x^2/(1-... (continued fraction).
a(n)=sum{k=0..floor(n/2), C(n-k,k)*A107841(n-2k)}.
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CROSSREFS
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Sequence in context: A074613 A039632 A143816 this_sequence A138792 A058056 A063768
Adjacent sequences: A160849 A160850 A160851 this_sequence A160853 A160854 A160855
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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), May 28 2009
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