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Search: id:A163274
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| 0, 2, 72, 648, 3200, 11250, 31752, 76832, 165888, 328050, 605000, 1054152, 1752192, 2798978, 4321800, 6480000, 9469952, 13530402, 18948168, 26064200, 35280000, 47064402, 61960712, 80594208, 103680000, 132031250, 166567752, 208324872
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OFFSET
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0,2
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COMMENT
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Row sums of triangle A163284.
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FORMULA
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a(n)=7*a(n-1)-21*a(n-2)+35*a(n-3)-35*a(n-4)+21*a(n-5)-7*a(n-6)+a(n-7). G.f.: -2*x*(1+29*x+93*x^2+53*x^3+4*x^4)/(x-1)^7 . [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 29 2009]
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CROSSREFS
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Cf. A006002, A099903, A163102, A163275, A163276, A163277, A163284.
Sequence in context: A071871 A055030 A053318 this_sequence A030993 A070775 A157061
Adjacent sequences: A163271 A163272 A163273 this_sequence A163275 A163276 A163277
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KEYWORD
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easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Jul 24 2009
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 29 2009
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