G.f.: Sum_{k>=0} A000009(k)^2 * x^k / Sum_{k>=0} A000041(k) * x^k.

Terms

a(0) =1a(1) =0a(2) =-1a(3) =2a(4) =-1a(5) =2a(6) =4a(7) =2a(8) =0a(9) =8a(10) =13a(11) =0a(12) =14a(13) =6a(14) =23a(15) =52a(16) =14a(17) =6a(18) =96a(19) =36a(20) =72a(21) =192a(22) =98a(23) =80a(24) =219a(25) =256a(26) =246a(27) =548a(28) =456a(29) =294