0,4

O.g.f.: x^2/((2*x-1)(x-1)(1+x)(1+2*x^2)). a(2n) = A084175(n). a(2n+1)=2*A084175(n). a(n) = 2a(n-1) -a(n-2) +2a(n-3) +2a(n-4) -4a(n-5). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 19 2008

Adjacent sequences: A138474 A138475 A138476 this_sequence A138478 A138479 A138480

Sequence in context: A081945 A158027 A100249 this_sequence A052102 A053561 A147773

nonn

Paul Curtz (bpcrtz(AT)free.fr), May 18 2008

More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 19 2008