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

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =11a(5) =22a(6) =41a(7) =77a(8) =144a(9) =267a(10) =495a(11) =915a(12) =1689a(13) =3115a(14) =5740a(15) =10572a(16) =19464a(17) =35825a(18) =65926a(19) =121301a(20) =223166a(21) =410544a(22) =755211a(23) =1389186a(24) =2555292a(25) =4700154a(26) =8645248a(27) =15901510a(28) =29247993a(29) =53796183