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A005908
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a(n) = [ tau*a(n-1) ] + [ tau*a(n-2) ].
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0
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0, 1, 1, 2, 4, 9, 20, 46, 106, 245, 567, 1313, 3041, 7044, 16317, 37798, 87559, 202831, 469860, 1088436, 2521375, 5840796, 13530276, 31343052, 72606569, 168194019, 389623535, 902567761, 2090809436, 4843386045
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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FORMULA
| Lim n -> infinity a(n)/a(n-1) = Phi / C = 2.31651242917313... where Phi is the golden ratio and C the positive root of x^4+x^3+-2x^2-2x-1 (C=0.6984784404...) - Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 13 2002
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CROSSREFS
| Sequence in context: A191653 A191827 A000968 * A206119 A085748 A052806
Adjacent sequences: A005905 A005906 A005907 * A005909 A005910 A005911
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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