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Search: id:A036256
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| A036256 |
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Sum(binomial(i,floor(i/2)),i=0..n). |
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+0
6
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| 1, 2, 4, 7, 13, 23, 43, 78, 148, 274, 526, 988, 1912, 3628, 7060, 13495, 26365, 50675, 99295, 191673, 376429, 729145, 1434577, 2786655, 5490811, 10691111, 21091711, 41150011, 81266611, 158825371, 313942891, 614483086, 1215563476
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OFFSET
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0,2
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COMMENT
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Equals row sums of triangle A145972 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 25 2008]
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REFERENCES
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L. H. Harper, Optimal numberings and isoperimetric problems on graphs, J. Comb. Th. 1 (1966), 385-393.
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FORMULA
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G.f.=2/[(1-z)(1-2z+sqrt(1-4z^2)]. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 25 2003
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CROSSREFS
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Partial sums of A001405.
A145972 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 25 2008]
Sequence in context: A048888 A026724 A054163 this_sequence A093629 A018182 A005595
Adjacent sequences: A036253 A036254 A036255 this_sequence A036257 A036258 A036259
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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