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%I #10 Oct 30 2018 03:32:29
%S 1,13,333,10712,400075,16435017,721861385,33308540000,1596292110000,
%T 78832566399375,3989172320345245,205979496842877048,
%U 10817872108002076923,576440295110730997877,31102930647624990624975
%N a(n) = (1/(8*n)) * Sum_{d|n} mu(n/d) * binomial(2*d,d)^3.
%o (PARI) a(n) = sumdiv(n, d, moebius(n/d)*binomial(2*d, d)^3)/(8*n) \\ _Michel Marcus_, Jun 15 2013
%K nonn
%O 1,2
%A Lionel Levine (levine(AT)ultranet.com)
%E More terms from _Erich Friedman_
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