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Search: id:A108982
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| 1, 6, 29, 146, 729, 3646, 18229, 91146, 455729, 2278646, 11393229, 56966146, 284830729, 1424153646, 7120768229, 35603841146, 178019205729, 890096028646, 4450480143229, 22252400716146, 111262003580729, 556310017903646
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OFFSET
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0,2
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FORMULA
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a(n) = 4a(n-1) + 5a(n-2), a(0) = 1, a(1) = 6.
a(2n) = 5a(2n-1) - 1; a(2n+1) = 5a(2n) + 1.
a(n)=-1/6*[(-1)^n-7*5^n], with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Nov 19 2008]
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CROSSREFS
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Sequence in context: A009153 A012325 A125785 this_sequence A059724 A000708 A027248
Adjacent sequences: A108979 A108980 A108981 this_sequence A108983 A108984 A108985
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KEYWORD
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nonn
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jul 23 2005
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EXTENSIONS
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Corrected and extended by T. D. Noe (noe(AT)sspectra.com), Nov 07 2006
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