OFFSET
0,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (0,0,0,48,0,0,0,-1).
FORMULA
G.f.: (1+x+4*x^2+5*x^3-4*x^4+x^5-x^6)/(1-48*x^4+x^8). [Colin Barker, Jan 03 2012]
MATHEMATICA
Table[Denominator[FromContinuedFraction[ContinuedFraction[Sqrt[23], n]]], {n, 1, 50}] (* Vladimir Joseph Stephan Orlovsky, Mar 17 2011 *)
Denominator[Convergents[Sqrt[23], 30]] (* or *) LinearRecurrence[ {0, 0, 0, 48, 0, 0, 0, -1}, {1, 1, 4, 5, 44, 49, 191, 240}, 30] (* Harvey P. Dale, Jun 22 2021 *)
CROSSREFS
KEYWORD
nonn,cofr,frac,easy
AUTHOR
STATUS
approved