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Search: id:A038340
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| 1, 4, 9, 50, 105, 616, 1287, 7601, 15873, 93819, 195910, 1158052, 2418195, 14294449, 29849041, 176444054, 368442700, 2177943781, 4547886208, 26883530748, 56137003923, 331837870408, 692929213991, 4096053203771, 8553197751125
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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F. v. Lamoen, Wave sequences
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FORMULA
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G.f.: (x^7+x^6-6*x^5-5*x^4+10*x^3+6*x^2-4*x-1) / (x^10-9*x^8+28*x^6-35*x^4+15*x^2-1). [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Jul 16 2009]
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MAPLE
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a:= n-> (Matrix ([`if` (irem(n, 2)=0, [9, 1, 0, -1, -4], [4, 0, -1, -3, -9])]). Matrix(5, (i, j)-> if i=j-1 then 1 elif j=1 then [15, -35, 28, -9, 1][i] else 0 fi) ^iquo(n+1, 2))[1, 2]: seq (a(n), n=0..24); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Jul 16 2009]
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CROSSREFS
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Sequence in context: A053925 A053943 A053955 this_sequence A016489 A030694 A060998
Adjacent sequences: A038337 A038338 A038339 this_sequence A038341 A038342 A038343
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KEYWORD
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nonn
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AUTHOR
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Floor van Lamoen (fvlamoen(AT)hotmail.com)
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EXTENSIONS
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More terms from Alois P. Heinz (heinz(AT)hs-heilbronn.de), Jul 16 2009
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