Bisection of A195240(n).

Terms

a(0) =1a(1) =7a(2) =11a(3) =7a(4) =19a(5) =337a(6) =5a(7) =-1681a(8) =22133a(9) =-87223a(10) =427291a(11) =-118181363a(12) =4276553a(13) =-11874730297