0,3

G.f.: 1/5-1/4/(t-1)-1/20/(3*t-1)+1/5/(2*t+1)-3/10/(5*t^2-1). a(n)=(5+3^n+(-1)^n*2^(n+2)+3*(1+(-1)^n)*sqrt(5)^n)/20 for n>0.

Sequence in context: A138540 A123023 A130637 this_sequence A086479 A091000 A013490

Adjacent sequences: A054879 A054880 A054881 this_sequence A054883 A054884 A054885

nonn,walk

Paolo Dominici (pl.dm(AT)libero.it), May 23 2000