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Search: id:A131721
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| 1, 1, 3, 7, 17, 41, 100, 240, 580, 1400, 3380, 8160, 19700, 47560, 114820, 277200, 669220, 1615640, 3900500, 9416640, 22733780, 54884200, 132502180, 319888560, 772279300, 1864447160, 4501173620, 10866794400, 26234762420, 63336319240
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OFFSET
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0,3
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FORMULA
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a(n) = A001333(n), n<6. a(n) = A001333(n)+A001333(n-6) = 20*A000129(n-3), n>=6.
O.g.f.: (x-1)(x^2+1)(x^4-x^2+1)/(-1+2x+x^2). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 16 2008
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CROSSREFS
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Cf. cf. A131710.
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KEYWORD
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nonn,new
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Sep 15 2007
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EXTENSIONS
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Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 16 2008
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