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

Terms

a(0) =1a(1) =3a(2) =6a(3) =11a(4) =20a(5) =36a(6) =64a(7) =113a(8) =199a(9) =350a(10) =615a(11) =1080a(12) =1896a(13) =3328a(14) =5841a(15) =10251a(16) =17990a(17) =31571a(18) =55404a(19) =97228a(20) =170624a(21) =299425a(22) =525455a(23) =922110a(24) =1618191a(25) =2839728a(26) =4983376a(27) =8745216a(28) =15346785a(29) =26931731