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Search: id:A074878
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| 1, 2, 6, 14, 32, 70, 150, 316, 658, 1358, 2784, 5678, 11534, 23356, 47178, 95110, 191440, 384854, 772902, 1550972, 3110306, 6234142
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(1)=1, a(2)=2, a(3)=6, a(n)=3*a(n-1)-a(n-2)-2*a(n-3) for n>3 . a(n)=3*2^(n-1)-2*F(n+1), F(n)=A000045(n) . G;f. x*(1-x+x^2)/(1-3*x+x^2+2*x^3) . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 20 2006
a(1)=1, a(n)=2*[a(n-1)+F(n-2)] where the Fibonacci number F(n-2)=A000045(n-2) - Anton Vrba (antonvrba(AT)yahoo.com), Feb 06 2007
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CROSSREFS
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Sequence in context: A055292 A035592 A096238 this_sequence A065495 A131352 A051485
Adjacent sequences: A074875 A074876 A074877 this_sequence A074879 A074880 A074881
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KEYWORD
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easy,nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Sep 30 2002
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EXTENSIONS
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More terms from Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 20 2006
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