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A026581
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T(n,0) + T(n,1) + ... + T(n,2n), T given by A026568.
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8
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1, 3, 7, 19, 47, 123, 311, 803, 2047, 5259, 13447, 34483, 88271, 226203, 579287, 1484099, 3801247, 9737643, 24942631, 63893203, 163663727, 419236539, 1073891447, 2750837603, 7046403391, 18049753803, 46235367367, 118434382579
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Row sums of Riordan array ((1+2x)/(1+x),x(1+2x)/(1+x)). Binomial transform is A055099. - Paul Barry (pbarry(AT)wit.ie), Jun 26 2008
Equals row sums of triangle A153341 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 24 2008]
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FORMULA
| G.f.: (1+2x)/(1-x-4x^2) (conjectured). - Ralf Stephan, Feb 04 2004
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CROSSREFS
| Cf. A006131, A026583, A026597, A026599, A052923.
A153341 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 24 2008]
Sequence in context: A141344 A029855 A110014 * A151535 A181360 A001372
Adjacent sequences: A026578 A026579 A026580 * A026582 A026583 A026584
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KEYWORD
| nonn
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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