%F A128862 (?)

[zak seidov]

Dear 
Steven, Neil, seqfans,

Is it OK with this %F,
what's x(n)? 

Thanks, Zak

%F A128862 x(n) + y(n)*sqrt(3) =
(3+sqrt(3))*(2+sqrt(3))^n s(n) = (y(n)+1)/2 a(n) =
(1/2)*(2+3*(s(n)^2-s(n)))
Steven Schlicker (schlicks(AT)gvsu.edu 


       
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Zak,  The intention is pretty clear, I think.
Here's an expanded version:

%F A128862 Define x(n) and y(n) by x(n) + y(n)*sqrt(3) = (3+sqrt(3))*(2+sqrt(3))^n; let s(n)  = (y(n)+1)/2; then a(n) = (1/2)*(2+3*(s(n)^2-s(n))).