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 A346761 #4 Aug 02 2021 07:55:28
%S A346761 0,0,0,1,5,15,35,69,126,205,330,479,715,966,1360,1750,2380,2919,3876,
%T A346761 4634,5950,6985,8855,10062,12645,14235,17424,19473,23751,25820,31465,
%U A346761 34140,40590,43996,52320,55365,66045,69939,81536,86476,101270,104964,123410,128435,147504
%N A346761 a(n) = Sum_{d|n} mu(n/d) * binomial(d,4).
%F A346761 G.f.: Sum_{k>=1} mu(k) * x^(4*k) / (1 - x^k)^5.
%F A346761 a(n) = (A059377(n) - 6 * A059376(n) + 11 * A007434(n) - 6 * A000010(n)) / 24.
%t A346761 Table[Sum[MoebiusMu[n/d] Binomial[d, 4], {d, Divisors[n]}], {n, 1, 45}]
%t A346761 nmax = 45; CoefficientList[Series[Sum[MoebiusMu[k] x^(4 k)/(1 - x^k)^5, {k, 1, nmax}], {x, 0, nmax}], x] // Rest
%Y A346761 4th column of A020921.
%Y A346761 Cf. A000010, A000332, A007434, A059376, A059377, A102309, A117109, A346760.
%K A346761 nonn
%O A346761 1,5
%A A346761 _Ilya Gutkovskiy_, Aug 02 2021