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