a(n) = A166405(n)-A166100(n).

Terms

a(0) =-1a(1) =1a(2) =0a(3) =7a(4) =-27a(5) =11a(6) =0a(7) =30a(8) =0a(9) =19a(10) =0a(11) =69a(12) =-250a(13) =9a(14) =0a(15) =93a(16) =0a(17) =70a(18) =0a(19) =156a(20) =0a(21) =43a(22) =0a(23) =235a(24) =-1029a(25) =102a(26) =0a(27) =220a(28) =0a(29) =177