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Search: id:A079284
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| 1, 1, 3, 4, 9, 13, 26, 39, 73, 112, 201, 313, 546, 859, 1469, 2328, 3925, 6253, 10434, 16687, 27633, 44320, 72977, 117297, 192322, 309619, 506037, 815656, 1329885, 2145541, 3491810
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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a(2n)-a(2n-1)=Fib(2n+1)
Diagonal sums of triangle A054450. - Paul Barry (pbarry(AT)wit.ie), Oct 23 2004
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FORMULA
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a(n)=sum(sum(binomial(n-j, i), i, 0, j), j, 0, floor(n/2))
a(n) = Fibonacci(n+3)-2^floor((n+1)/2). - Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 12 2003
G.f.: (1-x^2)/((1-x-x^2)(1-2x^2)); - Paul Barry (pbarry(AT)wit.ie), Jan 13 2005
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MAPLE
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with (combinat):a[0]:=0:a[1]:=1:a[2]:=1:for n from 2 to 50 do a[n]:=fibonacci(n-1)+2*a[n-2] od: seq(a[n], n=1..31); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 17 2008
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CROSSREFS
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Cf. A008949, A000045, A079284.
Cf. A061667, A005672.
Cf. A102517.
Sequence in context: A124285 A131326 A089300 this_sequence A000624 A056514 A151517
Adjacent sequences: A079281 A079282 A079283 this_sequence A079285 A079286 A079287
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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), Feb 08 2003
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