%I
%S 1,2,1,8,8,1,18,48,32,1,32,160,256,128,1,50,400,1120,1280,
%T 512,1,72,840,3584,6912,6144,2048,1,98,1568,9408,26880,39424,
%U 28672,8192,1,128,2688,21504,84480,180224,212992,131072,32768,1,162,4320,44352,228096,658944,1118208
%N Array of coefficients in Zagier's polynomials P_(n,0)(x).
%C Zagier's polynomial P_{n,m} (m<=n and m>=0) are used under parigp (for algorithmic acceleration of alternating or positive series)
%C Up to signs, coefficients of Chebyshev's Tpolynomials for even index. See A127674.
%F P_(n, 0)(x) = (1)^n*2^(2*n1)*prod(i=1, n, xcos(Pi*(2*i1)/4/n)^2)
%Y Cf. A000332.
%K sign,tabl
%O 1,2
%A _Benoit Cloitre_, Oct 18 2002
