%I A025171
%S A025171 1,2,12,56,80,1056,832,15232,43776,156160,1012736,473088,
%T A025171 17149952,26730496,220938240,869564416,1795883008,17504796672,
%U A025171 6275465216,267525816320,635459076096,3009494908928
%V A025171 1,-2,-12,56,80,-1056,832,15232,-43776,-156160,1012736,473088,
%W A025171 -17149952,26730496,220938240,-869564416,-1795883008,17504796672,
%X A025171 -6275465216,-267525816320,635459076096,3009494908928
%N A025171 Reciprocal Chebyshev polynomial of second kind evaluated at 4 multiplied 
               by (-1)^n.
%H A025171 <a href="Sindx_Ch.html#Cheby">Index entries for sequences related to 
               Chebyshev polynomials.</a>
%F A025171 G.f.: 1/(1+2x+16x^2).
%t A025171 Table[ a^n ChebyshevU[ n, -1/a ], {n, 0, 24} ]/.a->4
%o A025171 (PARI) a(n)=if(n<0,0,polcoeff(1/(1+2*x+16*x^2)+x*O(x^n),n))
%Y A025171 Sequence in context: A145766 A122676 A038175 this_sequence A127214 A124723 
               A122229
%Y A025171 Adjacent sequences: A025168 A025169 A025170 this_sequence A025172 A025173 
               A025174
%K A025171 sign
%O A025171 0,2
%A A025171 w.meeussen (wouter.meeussen(AT)pandora.be)