0,2

a(2n) = A022998(n+1). a(2n+1) = A016825(n+1) = 2*A005408(n+1).

a(4n) = 2n+1 = A005408(n). a(4n+2) = A008586(n+1) = 4*A000027(n+1).

a(n)=2*a(n-4)-a(n-8). G.f.: (1+6x+4x^2+10x^3+x^4+2x^5-2x^7)/((x-1)^2*(1+x)^2*(x^2+1)^2). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 08 2008

Sequence in context: A082209 A143520 A075450 this_sequence A015906 A116946 A141270

Adjacent sequences: A145976 A145977 A145978 this_sequence A145980 A145981 A145982

nonn

Paul Curtz (bpcrtz(AT)free.fr), Oct 26 2008

Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 08 2008