Expansion of g.f. (1-x^2-x^3)/((1+x+x^2)*(1-2*x-x^2-x^3+x^4)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =16a(5) =39a(6) =100a(7) =248a(8) =618a(9) =1546a(10) =3858a(11) =9631a(12) =24049a(13) =60041a(14) =149903a(15) =374266a(16) =934427a(17) =2332981a(18) =5824753a(19) =14542648a(20) =36308602a(21) =90651625a(22) =226329747a(23) =565077072a(24) =1410826915a(25) =3522409024a(26) =8794392287a(27) =21956943442a(28) =54819861280a(29) =136868649264