A279257 - OEIS

%I #4 Dec 12 2016 09:16:22

%S 1,1,3,11,19,361,307,24611,83579,2873041,12193841,512343611,869783713,

%T 11779156811,769881545161,44110959165011,299540369626699,

%U 19450718635716001,16510282817165209,10784052561125704811,8321625562774808569,7342627959965776406281

%N Numerators of coefficients in expansion of 1/(cos x - sin x).

%H Clark Kimberling, <a href="/A279257/b279257.txt">Table of n, a(n) for n = 0..1000</a>

%e 1/1 + (1/1)x + (3/2)x^2 + (11/6)x^3 + (19/8)x^3 + ... ; 1/1, 1/1, 3/2, 11/6, ... = A279257/A279258.

%t z = 30; t = CoefficientList[Series[1/(Cos[x] - Sin[x]), {x, 0, z}], x];

%t Numerator[t]   (* A279257 *)

%t Denominator[t] (* A279258 *)

%Y Cf. A279258.

%K nonn,easy,frac

%O 0,3

%A _Clark Kimberling_, Dec 11 2016