Expansion of 1 / Product_{k>=1} (1-x^k-x^(2*k)).

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =11a(5) =18a(6) =36a(7) =59a(8) =109a(9) =181a(10) =318a(11) =525a(12) =902a(13) =1481a(14) =2492a(15) =4087a(16) =6788a(17) =11090a(18) =18274a(19) =29776a(20) =48772a(21) =79332a(22) =129411a(23) =210172a(24) =341958a(25) =554728a(26) =900872a(27) =1460298a(28) =2368555a(29) =3837147