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a(n) = 37634*a(n-1) - a(n-2) + 3136; g.f.: (1+3120*x+15*x^2)/((1-x)*(1-37634*x+x^2)) - Warut Roonguthai Jan 08 2001
a(n+1)=18817*a(n)+1568+1358*(192*a(n)^2+32*a(n)+1)^0.5 - Richard Choulet, Sep 19 2007
a(n)=-(1/12)+(5/16)*sqrt(3)*{[18817+10864*sqrt(3)]^n-[18817-10864*sqrt(3)]^n}+(13/24)*[18817+10864*sqrt(3)]^n+[18817-10864*sqrt(3)]^n }, with n>=0 [From Paolo P. Lava, Nov 25 2008]
From Ant King, Dec 13 2011: (Start)
a(n) = 37635*a(n-1) - 37635*a(n-2) + a(n-3).
a(n) = 1/48*((2+sqrt(3))^(8n-5)+(2-sqrt(3))^(8n-5)-4).
a(n) = floor(1/48*(2+sqrt(3))^(8n-5)).
a(n) = 1/48*((tan(5*pi/12))^(8n-5)+(tan(pi/12))^(8n-5)-4).
a(n) = floor(1/48*(tan(5*pi/12))^(8n-5)).
(End)
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