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Search: id:A132805
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| 0, 3, 21, 171, 1365, 10923, 87381, 699051, 5592405, 44739243, 357913941, 2863311531, 22906492245, 183251937963, 1466015503701, 11728124029611, 93824992236885, 750599937895083, 6004799503160661, 48038396025285291, 384307168202282325, 3074457345618258603
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OFFSET
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0,2
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FORMULA
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a(n) = A132804(n)/2 . G.f.: 3x/(1-7x-8x^2). a(n+1)=7*a(n)+8*a(n-1) for n>=1, a(0)=0, a(1)=3 . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 19 2007
a(n)=-(1/3)*(-1)^n+(1/3)*8^n, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Jul 08 2008
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CROSSREFS
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Cf. A029898.
Sequence in context: A058194 A118353 A046637 this_sequence A054879 A131763 A006199
Adjacent sequences: A132802 A132803 A132804 this_sequence A132806 A132807 A132808
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Nov 18 2007
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