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 A040387 Continued fraction for sqrt(408). 2
 20, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40, 5, 40 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Index entries for linear recurrences with constant coefficients, signature (0,1). FORMULA a(n)=(1/2)*[45+35*(-1)^n]-20*[C(2*n,n) mod 2], with n>=0 [From Paolo P. Lava, Apr 30 2009] a(n) = 5*(9+7*(-1)^n)/2 for n>0. a(n) = a(n-2) for n>2. G.f.: -5*(4*x^2+x+4) / ((x-1)*(x+1)). [Colin Barker, Mar 25 2013] MAPLE with(numtheory): Digits := 300: convert(evalf(sqrt(408)), confrac); CROSSREFS Sequence in context: A104158 A068612 A233820 * A201137 A040385 A161997 Adjacent sequences:  A040384 A040385 A040386 * A040388 A040389 A040390 KEYWORD nonn,cofr,easy AUTHOR STATUS approved

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Last modified July 18 21:25 EDT 2019. Contains 325144 sequences. (Running on oeis4.)