Expansion of Product_{k>=1} (1 + x^k*(1+x)) / (1 - x^k*(1+x)).

Terms

a(0) =1a(1) =2a(2) =6a(3) =14a(4) =32a(5) =68a(6) =140a(7) =280a(8) =544a(9) =1034a(10) =1930a(11) =3544a(12) =6416a(13) =11472a(14) =20288a(15) =35532a(16) =61696a(17) =106304a(18) =181906a(19) =309362a(20) =523228a(21) =880576a(22) =1475424a(23) =2462302a(24) =4094682a(25) =6787588a(26) =11219504a(27) =18498094a(28) =30429502a(29) =49955706