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

Terms

a(0) =1a(1) =0a(2) =1a(3) =2a(4) =3a(5) =8a(6) =13a(7) =30a(8) =55a(9) =116a(10) =225a(11) =458a(12) =907a(13) =1824a(14) =3637a(15) =7286a(16) =14559a(17) =29132a(18) =58249a(19) =116514a(20) =233011a(21) =466040a(22) =932061a(23) =1864142a(24) =3728263a(25) =7456548a(26) =14913073a(27) =29826170a(28) =59652315a(29) =119304656