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 A346935 #5 Aug 08 2021 08:37:17
%S A346935 1,3,21,136,968,7059,53819,420592,3362238,27342916,225568797,
%T A346935 1882926144,15875338989,134993712777,1156393242330,9969937070688,
%U A346935 86445222719723,753310719641286,6594154339031799,57956002304003096,511238042454487704,4524678117713613419,40166643855158315819
%N A346935 a(n) = Sum_{d|n} mu(n/d) * binomial(4*d,d) / (3*d+1).
%C A346935 Moebius transform of A002293.
%t A346935 Table[Sum[MoebiusMu[n/d] Binomial[4 d, d]/(3 d + 1), {d, Divisors[n]}], {n, 23}]
%Y A346935 Cf. A002293, A002996, A008683, A346925, A346936, A346937, A346938, A346939.
%K A346935 nonn
%O A346935 1,2
%A A346935 _Ilya Gutkovskiy_, Aug 08 2021