Bisection of A262310.

Terms

a(0) =1a(1) =1a(2) =9a(3) =49a(4) =57a(5) =2401a(6) =-9063a(7) =-153502a(8) =-755943a(9) =-767039a(10) =-40127031a(11) =-58813391a(12) =-1696965207a(13) =-4483997699a(14) =105920054242a(15) =-203398909151a(16) =555306094297