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%I
%S 1,4,33,304,3175,35556,420665,5176000,65664000,853367900,11309870605,
%T 152342891952,2080240006923,28738242567524,401024083514775,
%U 5645275548076800,80084088088568947,1143862232096407392,16437995698573558421,237520818846111947600
%N a(n) = (1/(4*n)) * Sum_{d|n} mu(n/d) * binomial(2*d, d)^2.
%o (PARI) a(n) = sumdiv(n, d, moebius(n/d)*binomial(2*d, d)^2)/(4*n) \\ _Michel Marcus_, Jun 15 2013
%K nonn
%O 1,2
%A Lionel Levine (levine(AT)ultranet.com)
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