0,2

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 479

G.f.: 1/(1-2x-x^4) . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 02 2006

A008999 := proc(n) option remember; if n <= 3 then 2^n else 2*A008999(n-1)+A008999(n-4); fi; end;

Sequence in context: A136750 A097107 A098083 this_sequence A052903 A063457 A157904

Adjacent sequences: A008996 A008997 A008998 this_sequence A009000 A009001 A009002

nonn

N. J. A. Sloane (njas(AT)research.att.com).