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Search: id:A026674
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| 1, 4, 16, 65, 267, 1105, 4597, 19196, 80380, 337284, 1417582, 5965622, 25130844, 105954110, 447015744, 1886996681, 7969339643, 33670068133, 142301618265, 601586916703, 2543852427847, 10759094481491, 45513214057191, 192560373660245
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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Paul Barry, A Catalan Transform and Related Transformations on Integer Sequences, Journal of Integer Sequences, Vol. 8 (2005), Article 05.4.5.
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LINKS
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Rob Arthan, Comments on A026674, A026725, A026670
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FORMULA
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G.f.: 1/2*[(1-x)/(sqrt(1-4x)-x)-1] (conjectured). - Ralf Stephan, Feb 05 2004
G.f.: xc(x)^3/(1-x*c(x)^3)=(1-5x-(1-x)sqrt(1-4x))/(2(x^2+4x-1)), c(x) the g.f. of A000108; - Paul Barry (pbarry(AT)wit.ie), Mar 19 2007
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CROSSREFS
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Also a(n) = T(2n-1, n-1), T given by A026670.
Sequence in context: A012781 A132820 A165201 this_sequence A099781 A026872 A081915
Adjacent sequences: A026671 A026672 A026673 this_sequence A026675 A026676 A026677
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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