0,3

G.f.: -1/12/(5*t-1)+5/12/(t+1)-(1/2)/(5*t^2-1). a(n)=(5^n+(-1)^n*5+3*(1+(-1)^n)*sqrt(5)^n)/12

{a(n)/5} for n>1 is A030517.

Sequence in context: A061518 A062162 A062848 this_sequence A056316 A120834 A089745

Adjacent sequences: A054881 A054882 A054883 this_sequence A054885 A054886 A054887

nonn,walk

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