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.
%I A078387 #15 Mar 27 2025 04:25:00
%S A078387 -1,-1,0,1,0,-1,0,1,0,-1,1,0,-1,-1,0,0,0,1,0,1,0,0,-1,0,0,1,-1,1,0,-1,
%T A078387 0,-1,1,0,-1,0,1,1,1,1,0,0,0,1,0,-1,0,-1,1,1,0,0,-1,0,1,0,1,0,-1,0,1,
%U A078387 0,-1,-1,-1,0,-1,0,0,1,-1,0,-1,0,-1,0,0,0,0,1,0,0,-1,0,-1,0,0,0,-1,-1,0,1,0,0,-1,1,-1
%N A078387 Moebius's mu of numbers which can be written as sum of a positive square and a positive cube.
%H A078387 Amiram Eldar, <a href="/A078387/b078387.txt">Table of n, a(n) for n = 1..10000</a>
%F A078387 a(n) = A008683(A055394(n)).
%t A078387 MoebiusMu[Select[Range[200], Length[Reduce[a^2 + b^3 == # && a > 0 && b > 0, {a, b}, Integers]] > 0 &]] (* _Amiram Eldar_, Mar 27 2025 *)
%Y A078387 Cf. A008683, A055394, A078386.
%K A078387 sign
%O A078387 1,1
%A A078387 _Reinhard Zumkeller_, Nov 25 2002