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Search: id:A055251
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| 1, 10, 57, 244, 874, 2772, 8054, 21920, 56751, 141326, 341303, 804276, 1858080, 4223784, 9474444, 21018144, 46195149, 100734354, 218190469, 469866964, 1006759110, 2147634364, 4563581746, 9663887808, 20401343003, 42949963286
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OFFSET
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0,2
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FORMULA
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G.f. 1/(((1-2*x)^2)*(1-x)^6)
a(n)= A055249(n+7, 7). a(n)= sum(a(j), j=0..n-1)+A035039(n+7), n >= 1.
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MAPLE
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(Maple) a := n -> (Matrix(8, (i, j)-> if (i=j-1) then 1 elif j=1 then [10, -43, 104, -155, 146, -85, 28, -4][i] else 0 fi)^(n))[1, 1]; seq (a(n), n=0..25); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Aug 05 2008]
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CROSSREFS
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Cf. A055249, A035039, partial sums of A055250.
Sequence in context: A061005 A006550 A047780 this_sequence A038733 A004142 A006529
Adjacent sequences: A055248 A055249 A055250 this_sequence A055252 A055253 A055254
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KEYWORD
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easy,nonn
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), May 26 2000
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