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%I #15 Sep 08 2022 08:45:37
%S 2,9,1,5,6,0,9,0,4,0,3,0,8,1,8,7,8,0,1,3,8,3,8,4,4,5,6,4,6,8,3,9,4,9,
%T 1,8,8,6,4,0,6,6,1,5,3,9,8,5,8,3,7,2,7,0,2,6,1,0,0,1,5,6,9,1,1,1,7,4,
%U 7,6,3,6,8,8,0,4,3,8,8,6,1,7,2,6,6,2,6,8,2,4,3,0,3,1,3,4,0,5,8,9,0,8,9,7,2
%N Decimal expansion of the dimer constant.
%H G. C. Greubel, <a href="/A143233/b143233.txt">Table of n, a(n) for n = 0..10000</a>
%H Yong Kong, <a href="http://arxiv.org/abs/cond-mat/0610690">Monomer-dimer model in two-dimensional rectangular lattices with fixed dimer density</a>, arXiv:cond-mat/0610690
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/DominoTiling.html">Domino Tiling</a>
%F Equals Catalan/Pi.
%F Also equals integral_{t=-Pi..Pi} arccosh(sqrt(cos(t)+3)/sqrt(2))/(4*Pi) dt. - _Jean-François Alcover_, May 14 2014
%e 0.29156090403081878013...
%t RealDigits[Catalan/Pi, 10, 100][[1]] (* _G. C. Greubel_, Aug 24 2018 *)
%o (PARI) default(realprecision, 100); Catalan/Pi \\ _G. C. Greubel_, Aug 24 2018
%o (Magma) SetDefaultRealField(RealField(100)); R:=RealField(); Catalan(R)/Pi(R); // _G. C. Greubel_, Aug 24 2018
%Y Cf. A000796, A006752.
%K nonn,cons
%O 0,1
%A _Eric W. Weisstein_, Jul 31 2008
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