Expansion of b(2)*b(6)/(1 - 2*x + x^3 - x^4 - x^5 + 2*x^6), where b(k) = (1-x^k)/(1-x).

Terms

a(0) =1a(1) =4a(2) =10a(3) =21a(4) =41a(5) =79a(6) =150a(7) =282a(8) =527a(9) =982a(10) =1829a(11) =3405a(12) =6337a(13) =11790a(14) =21932a(15) =40797a(16) =75888a(17) =141161a(18) =262573a(19) =488407a(20) =908474a(21) =1689830a(22) =3143211a(23) =5846606a(24) =10875117a(25) =20228513a(26) =37626513a(27) =69988066a(28) =130182920a(29) =242149745