%I A077241
%S A077241 1,2,8,13,47,76,274,443,1597,2582,9308,15049,54251,87712,316198,511223,
%T A077241 1842937,2979626,10741424,17366533,62605607,101219572,364892218,
%U A077241 589950899,2126747701,3438485822,12395593988
%N A077241 Combined Diophantine Chebyshev sequences A054488 and A077413.
%C A077241 -8*a(n)^2 + b(n)^2 = 17, with the companion sequence b(n)= A077242(n).
%H A077241 <a href="Sindx_Ch.html#Cheby">Index entries for sequences related to 
               Chebyshev polynomials.</a>
%F A077241 a(2*k)= A054488(k) and a(2*k+1)= A077413(k), k>=0.
%F A077241 G.f.: (1+x)*(1+x+x^2)/(1-6*x^2+x^4).
%e A077241 8*a(2)^2 + 17 = 8*8^2+17 = 529 = 23^2 = A077242(2)^2.
%Y A077241 Sequence in context: A037382 A095825 A106359 this_sequence A066567 A002248 
               A050619
%Y A077241 Adjacent sequences: A077238 A077239 A077240 this_sequence A077242 A077243 
               A077244
%K A077241 nonn,easy
%O A077241 0,2
%A A077241 Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Nov 08 
               2002