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 A378653 #10 Dec 04 2024 10:16:54
%S A378653 0,0,0,0,0,0,0,0,0,0,0,4,0,0,0,0,0,4,0,2,0,0,0,20,0,0,0,0,0,12,0,0,0,
%T A378653 0,0,36,0,0,0,14,0,12,0,0,0,0,0,68,0,0,0,0,0,20,0,8,0,0,0,84,0,0,0,0,
%U A378653 0,12,0,0,0,4,0,156,0,0,0,0,0,12,0,54,0,0,0,88,0,0,0,4,0,86,0,0,0,0,0,196,0,0,0,22,0,12,0,2,0
%N A378653 a(n) = A378648(n) - sigma(n).
%H A378653 Antti Karttunen, <a href="/A378653/b378653.txt">Table of n, a(n) for n = 1..20000</a>
%F A378653 a(n) = A378648(n) - A000203(n).
%F A378653 a(n) = Sum_{d|n} A378650(d).
%o A378653 (PARI) A378653(n) = (A378648(n) - sigma(n));
%Y A378653 Inverse Möbius transform of A378650.
%Y A378653 Cf. A000203, A378648.
%Y A378653 Cf. A005101 (positions of nonzero terms), A263837 (of 0's).
%K A378653 nonn
%O A378653 1,12
%A A378653 _Antti Karttunen_, Dec 03 2024