cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A127245 Row sums of a signed Thue-Morse related triangle.

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%I A127245 #7 Aug 04 2023 04:35:07
%S A127245 1,0,1,1,0,1,1,0,1,1,1,0,1,0,1,1,0,1,1,0,1,0,1,1,1,0,1,1,0,1,1,0,1,1,
%T A127245 1,0,1,0,1,1,1,0,1,1,0,1,1,0,1,0,1,1,0,1,1,0,1,1,1,0,1,0,1,1,0,1,1,0,
%U A127245 1,0,1,1,1,0,1,1,0,1,1,0,1,0,1,1,0,1,1
%N A127245 Row sums of a signed Thue-Morse related triangle.
%C A127245 0's occur at positions indexed by the odious numbers given by A091855.
%F A127245 a(n) = A127246(n) mod 2.
%F A127245 a(n) = Sum_{k=0..n} ((-1)^(n-k) * Product_{j=0..n-k-1} A010060(n-j)).
%t A127245 a[n_] := Mod[Sum[Product[ThueMorse[i], {i, k+1, n}], {k, 0, n}], 2]; Array[a, 100, 0] (* _Amiram Eldar_, Aug 04 2023 *)
%Y A127245 Row sums of A127244.
%Y A127245 Cf. A000069, A010060, A091855, A127246.
%K A127245 easy,nonn
%O A127245 0,1
%A A127245 _Paul Barry_, Jan 10 2007
%E A127245 More terms from _Amiram Eldar_, Aug 04 2023