Expansion of (1+x)*(1+x^2)/((1-x)^2*(1+x+x^2)*(1-4*x)).

Terms

a(0) =1a(1) =6a(2) =27a(3) =113a(4) =458a(5) =1839a(6) =7365a(7) =29470a(8) =117891a(9) =471577a(10) =1886322a(11) =7545303a(12) =30181229a(13) =120724934a(14) =482899755a(15) =1931599041a(16) =7726396186a(17) =30905584767a(18) =123622339093a(19) =494489356398