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

Terms

a(0) =1a(1) =3a(2) =11a(3) =35a(4) =111a(5) =343a(6) =1051a(7) =3195a(8) =9671a(9) =29183a(10) =87891a(11) =264355a(12) =794431a(13) =2386023a(14) =7163531a(15) =21501515a(16) =64526391a(17) =193622863a(18) =580955971a(19) =1743042675a(20) =5229477551a(21) =15689131703a(22) =47068793211a(23) =141209175835a(24) =423633119911