%I #6 Jun 23 2017 21:19:47

%S -1,2,-4,12,-20,28,-20,20,-44,84,-104,120,-60,16,-64,208,-252,276,

%T -152,64,-164,404,-376,304,-216,180,-360,688,-776,772,-344,144,-224,

%U 384,-720,1080,-540,288,-704,1408,-1536,1524,-608,136,-620,1764,-1676,1444,-944,544

%N Image of Euler totient function (A000010) under "little Hankel" transform that sends [c_0, c_1, ...] to [d_0, d_1, ...] where d_n = c_n^2 - c_{n+1}*c_{n-1}.

%K sign

%O 1,2

%A _N. J. A. Sloane_, Aug 06 2000