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1, 1, 2, 3, 3, 6, 4, 10, 5, 15, 6, 21, 7, 28, 8, 36, 9, 45, 10, 55, 11, 66, 12, 78, 13, 91, 14, 105, 15, 120, 16, 136, 17, 153, 18, 171, 19, 190, 20, 210, 21, 231, 22, 253, 23, 276, 24, 300, 25, 325, 26, 351, 27, 378, 28, 406, 29, 435, 30, 465
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (0,3,0,-3,0,1).
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FORMULA
| a(2n+1)=n+1 and a(2n)=A000217(n) with a(n) = 3*a(n-2)-3*a(n-4)+a(n-6) and g.f. x*(1+x-x^2)/(1-x^2)^3. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 09 2010]
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CROSSREFS
| Cf. A160791, A160792, A160793.
Sequence in context: A173739 A062774 A045892 * A115973 A057047 A101447
Adjacent sequences: A160788 A160789 A160790 * A160792 A160793 A160794
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), May 29 2009
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