0,2

Recurrence: a(n) = 6*a(n-1)-13*a(n-2)+12*a(n-3)-4*a(n-4). G.f.: x*(3-8*x+6*x^2)/(1-x)^2/(1-2*x)^2.

Cf. A066524.

Sequence in context: A056681 A100624 A088809 this_sequence A085948 A000471 A000501

Adjacent sequences: A069226 A069227 A069228 this_sequence A069230 A069231 A069232

nonn

Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 12 2002