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Search: id:A015551
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| A015551 |
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Linear 2nd order recurrence. |
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+0
4
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| 0, 1, 6, 41, 276, 1861, 12546, 84581, 570216, 3844201, 25916286, 174718721, 1177893756, 7940956141, 53535205626, 360916014461, 2433172114896, 16403612761681, 110587537144566, 745543286675801, 5026197405777636
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Let the generator matrix for the ternary Golay G_12 code be [I|B], where the elements of B are taken from the set {0,1,2}. Then a(n)=(B^n)_1,2 for instance. - Paul Barry (pbarry(AT)wit.ie), Feb 13 2004
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FORMULA
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a(n) = 6 a(n-1) + 5 a(n-2).
a(n)=sqrt(14)(3+sqrt(14))^n/28-sqrt(14)(3-sqrt(14))^n/28 - Paul Barry (pbarry(AT)wit.ie), Feb 13 2004
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CROSSREFS
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Sequence in context: A000611 A043069 A135232 this_sequence A049685 A122371 A083067
Adjacent sequences: A015548 A015549 A015550 this_sequence A015552 A015553 A015554
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KEYWORD
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nonn,easy
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AUTHOR
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Olivier Gerard (ogerard(AT)ext.jussieu.fr)
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