Expansion of 1 / ((1-x)^3 - x^3)^2.

Terms

a(0) =1a(1) =6a(2) =21a(3) =58a(4) =144a(5) =342a(6) =795a(7) =1818a(8) =4095a(9) =9104a(10) =20028a(11) =43692a(12) =94661a(13) =203886a(14) =436905a(15) =932070a(16) =1980648a(17) =4194306a(18) =8854639a(19) =18641346a(20) =39146835a(21) =82021948a(22) =171500436a(23) =357913944a(24) =745654041a(25) =1550960406a(26) =3221225469a(27) =6681060242a(28) =13839339072a(29) =28633115310