0,4

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 A030518.

Sequence in context: A061991 A060580 A118266 this_sequence A000449 A027274 A012868

Adjacent sequences: A054882 A054883 A054884 this_sequence A054886 A054887 A054888

nonn,walk

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