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A083335 a(n)=12a(n-2)-25a(n-4). 1
1, 1, 7, 12, 59, 119, 533, 1128, 4921, 10561, 45727, 98532, 425699, 918359, 3965213, 8557008, 36940081, 79725121, 344150647, 742776252, 3206305739, 6920186999, 29871902693, 64472837688, 278305188841, 600669377281, 2592864698767 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

A083334(n)/a(n) converges to sqrt(11)

LINKS

Table of n, a(n) for n=0..26.

Index entries for linear recurrences with constant coefficients, signature (0, 12, 0, -25).

FORMULA

G.f.: (1+x-5x^2)/(1-12x^2+25x^4)

MATHEMATICA

CoefficientList[Series[(1+x-5x^2)/(1-12x^2+25x^4), {x, 0, 30}], x]

LinearRecurrence[{0, 12, 0, -25}, {1, 1, 7, 12}, 30] (* Harvey P. Dale, Mar 19 2013 *)

CROSSREFS

Sequence in context: A108238 A038278 A266056 * A119179 A121983 A177169

Adjacent sequences:  A083332 A083333 A083334 * A083336 A083337 A083338

KEYWORD

easy,nonn

AUTHOR

Mario Catalani (mario.catalani(AT)unito.it), Apr 26 2003

STATUS

approved

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Last modified July 19 08:23 EDT 2019. Contains 325155 sequences. (Running on oeis4.)