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A155046
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List of pairs: first pair is (1,1); then follow (x,y) by (x+2y, x+y).
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0
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1, 1, 3, 2, 7, 5, 17, 12, 41, 29, 99, 70, 239, 169, 577, 408, 1393, 985, 3363, 2378, 8119, 5741, 19601, 13860, 47321, 33461, 114243, 80782, 275807, 195025, 665857, 470832, 1607521, 1136689, 3880899, 2744210, 9369319, 6625109, 22619537, 15994428
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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FORMULA
| a(n)=2*a(n-2)+a(n-4). Sequence of x: A078057(n). Sequence of y: A000129(n). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 19 2009]
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EXAMPLE
| (1,1), (3,2), (7,5), (17,12)
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CROSSREFS
| Cf. A002965 [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Feb 08 2009]
Sequence in context: A195820 A006921 A014693 * A033318 A093780 A161749
Adjacent sequences: A155043 A155044 A155045 * A155047 A155048 A155049
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KEYWORD
| nonn,tabf
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 19 2009
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EXTENSIONS
| Corrected first term in two pairs. R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 19 2009
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