0,2

G.f.: 2x/(1-10x+20x^2); a(n)=((5+sqrt(5))^n-(5-sqrt(5))^n)/sqrt(5); a(n)=2^n*A093131(n).

Cf. A000045.

Sequence in context: A081159 A105489 A093302 this_sequence A043029 A115489 A105493

Adjacent sequences: A093127 A093128 A093129 this_sequence A093131 A093132 A093133

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Mar 23 2004