0,2

a(n)= (n+2)*((3*n+1)*F(n-1)/2+(2*n+1)*F(n)), with F(n) := A000045(n) (Fibonacci).

G.f.: (1+4*x-x^2)*(1+2*x)/(1-x-x^2)^3.

Sequence in context: A014816 A147691 A000441 this_sequence A002881 A005344 A050478

Adjacent sequences: A067986 A067987 A067988 this_sequence A067990 A067991 A067992

nonn,easy

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Feb 15 2002