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 A346582 #6 Jul 25 2021 02:41:33
%S A346582 1,7,84,1120,16450,255612,4141382,69158272,1182125043,20581143150,
%T A346582 363704640475,6506965023168,117626432708863,2145180354493274,
%U A346582 39421026305266125,729242353100281344,13568988503585900647,253785064585174078869,4768543107831461199896,89970814565326816488000
%N A346582 a(n) = (1/(8*n)) * Sum_{d|n} mu(n/d) * binomial(8*d,d).
%C A346582 Inverse Euler transform of A007556.
%C A346582 Moebius transform of A261501.
%t A346582 Table[(1/(8 n)) Sum[MoebiusMu[n/d] Binomial[8 d, d], {d, Divisors[n]}], {n, 20}]
%o A346582 (PARI) a(n) = sumdiv(n, d, moebius(n/d)*binomial(8*d,d))/(8*n); \\ _Michel Marcus_, Jul 24 2021
%Y A346582 Cf. A004381, A007556, A008683, A022553, A261501, A346577, A346578, A346579, A346580, A346581.
%K A346582 nonn
%O A346582 1,2
%A A346582 _Ilya Gutkovskiy_, Jul 24 2021