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%I #13 Aug 19 2021 07:19:50
%S 4,9,1,0,8,1,4,9,6,4,5,6,8,2,5,5,8,9,8,7,5,1,5,3,4,8,0,5,2,4,0,3,5,2,
%T 1,9,7,8,9,8,7,0,5,2,8,1,7,6,7,8,4,7,1,7,6,1,3,9,4,1,1,2,0,2,2,5,6,4,
%U 1,7,8,7,7,8,7,9,9,4,7,9,7,2,9,5,1,8,1,9,7,4,1,5,3,5,5,4,4,6,1,4,2,5,0,5,3
%N Decimal expansion of a constant related to A187235.
%H V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a>, 6ed, 2013, p.261.
%F Equals lim n->infinity (A187235(n)/(n-1)!)^(1/n).
%F Equals -(2*LambertW(-1,-exp(-1/2)/2))^2 / (1 + 2*LambertW(-1,-exp(-1/2)/2)).
%e 4.9108149645682558987515348...
%t RealDigits[N[-(2*LambertW[-1,-1/2/Sqrt[E]])^2/(1+2*LambertW[-1,-1/2/Sqrt[E]]), 105]][[1]]
%Y Cf. A187235, A238262, A002465, A129256, A342111, A330287.
%K nonn,cons
%O 1,1
%A _Vaclav Kotesovec_, Feb 21 2014
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