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1, 5, 11, 21, 39, 73, 139, 269, 527, 1041, 2067, 4117, 8215, 16409, 32795, 65565, 131103, 262177, 524323, 1048613, 2097191, 4194345, 8388651, 16777261, 33554479, 67108913, 134217779, 268435509, 536870967, 1073741881, 2147483707, 4294967357, 8589934655, 17179869249
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Row sums of triangle A131897.
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (4,-5,2).
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FORMULA
| Binomial transform of (1, 4, 2, 2, 2,...).
G.f. ( -1-x+4*x^2 ) / ( (2*x-1)*(x-1)^2 ). - R. J. Mathar, Jul 03 2011
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EXAMPLE
| a(3) = 21 = sum of row 3 terms of triangle A131897: (11 + 4 + 2 + 4).
a(3) = 21 = (1, 3, 3, 1) dot (1, 4, 2, 2) = (1 + 12 + 6 + 2).
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CROSSREFS
| Cf. A131897.
Sequence in context: A163787 A166863 A163704 * A168642 A184552 A069097
Adjacent sequences: A131895 A131896 A131897 * A131899 A131900 A131901
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KEYWORD
| nonn,easy
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AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 25 2007
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