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

Terms

a(0) =1a(1) =2a(2) =7a(3) =18a(4) =47a(5) =118a(6) =290a(7) =702a(8) =1677a(9) =3966a(10) =9300a(11) =21654a(12) =50116a(13) =115388a(14) =264475a(15) =603792a(16) =1373621a(17) =3115222a(18) =7045205a(19) =15892794a(20) =35769390a(21) =80337144a(22) =180091131a(23) =403002108a(24) =900370600a(25) =2008572044a(26) =4474586920a(27) =9955434456a(28) =22123162421a(29) =49107537598