0,2

G.f.: (1-6x)/(1-12x+6x^2) .

a(n)=(1/2)*{[6+sqrt(30)]^n+[6-sqrt(30)]^n , with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Sep 16 2009]

Sequence in context: A131519 A022024 A129554 this_sequence A127857 A127858 A004355

Adjacent sequences: A165226 A165227 A165228 this_sequence A165230 A165231 A165232

nonn

Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 09 2009