1,1

G.f.: (1-sqrt(1-4*x-8*x^2))/2 - Michael Somos, Jun 08, 2000.

(PARI) a(n)=polcoeff((1-sqrt(1-4*x-8*x^2+x*O(x^n)))/2, n)

Essentially the same as A025229.

Sequence in context: A000372 A123930 A125601 this_sequence A127294 A012924 A024485

Adjacent sequences: A025236 A025237 A025238 this_sequence A025240 A025241 A025242

nonn

Clark Kimberling (ck6(AT)evansville.edu)