0,3

G.f.: x(1-4x-x^2)/((1+2x-x^2)(1-14x-x^2)); a(n)=12a(n-1)+30a(n-2)-12a(n-3)-a(n-4); a(n)=Pell(3n)/8-3*(-1)^n*Pell(n)/8.

Cf. A000129.

Adjacent sequences: A110269 A110270 A110271 this_sequence A110273 A110274 A110275

Sequence in context: A050803 A061103 A016791 this_sequence A033536 A076960 A035130

easy,nonn

Paul Barry (pbarry(AT)wit.ie), Jul 18 2005