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A319117 Sign of the n-th Maclaurin coefficient of 1/(exp(x) + exp(1)/2). 0

%I #17 Apr 21 2024 22:26:28

%S 1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,1,-1,-1,1,1,-1,-1,1,1,-1,

%T -1,1,1,-1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,-1,1,1,-1,-1,

%U 1,1,-1,-1,1,1,-1,-1,1,1,1,-1,-1,1,1,-1,-1,1,1,-1

%N Sign of the n-th Maclaurin coefficient of 1/(exp(x) + exp(1)/2).

%e a(1) = -a(485) = a(969) = -1.

%p S:= series(1/(exp(x)+exp(1)/2), x, 147):

%p seq(signum(coeff(S, x, j)), j=0..146);

%Y Cf. A210245, A210247.

%K sign,changed

%O 0

%A _Mikhail Kurkov_, Sep 10 2018 [verification needed]

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Last modified April 24 00:30 EDT 2024. Contains 371917 sequences. (Running on oeis4.)