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A057198
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(5*3^(n-1)+1)/2, n >= 1.
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4
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1, 3, 8, 23, 68, 203, 608, 1823, 5468, 16403, 49208, 147623, 442868, 1328603, 3985808, 11957423, 35872268, 107616803, 322850408, 968551223, 2905653668, 8716961003, 26150883008, 78452649023, 235357947068, 706073841203, 2118221523608
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| It appears that if s(n) is a first order rational sequence of the form s(0)=4, s(n)= (2*s(n-1)+1)/(s(n-1)+2), n>0, then s(n) = a(n)/(a(n)-1), n>0.
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FORMULA
| a(n+1) = 3*a(n) - 1 for n > 0. [From Reinhard Zumkeller, Jan 22 2011]
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CROSSREFS
| Related to A046901.
Equals A060816 + 1.
Sequence in context: A025578 A038151 A199103 * A025262 A056010 A002712
Adjacent sequences: A057195 A057196 A057197 * A057199 A057200 A057201
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KEYWORD
| nonn
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AUTHOR
| C. L. Mallows and N. J. A. Sloane (njas(AT)research.att.com), Sep 16 2000
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