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A041142 Numerators of continued fraction convergents to sqrt(80). 1
1, 8, 9, 152, 161, 2728, 2889, 48952, 51841, 878408, 930249, 15762392, 16692641, 282844648, 299537289, 5075441272, 5374978561, 91075098248, 96450076809, 1634276327192, 1730726404001, 29325898791208, 31056625195209 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

G.f.: (1+8*x-9*x^2+8*x^3)/(1-18*x^2+x^4). a(n)=18*a(n-2)-a(n-4).

CROSSREFS

Cf. A041143.

Sequence in context: A175556 A165467 A041141 * A175849 A041605 A115073

Adjacent sequences:  A041139 A041140 A041141 * A041143 A041144 A041145

KEYWORD

nonn,cofr,easy

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 14 08:58 EST 2012. Contains 205614 sequences.