A195503 Numerators b(n) of Pythagorean approximations b(n)/a(n) to sqrt(3).
4, 15, 56, 209, 780, 2911, 10864, 40545, 151316, 564719, 2107560, 7865521, 29354524, 109552575, 408855776, 1525870529, 5694626340, 21252634831, 79315912984, 296011017105, 1104728155436, 4122901604639, 15386878263120, 57424611447841
Offset: 1
Links
- Index entries for linear recurrences with constant coefficients, signature (4,-1).
Formula
a(n) = A001353(n+1). - R. J. Mathar, Sep 21 2011
Empirical g.f.: x*(4-x)/(1-4*x+x^2). - Colin Barker, Jan 04 2012
Comments