Numerator in fraction A180878/A060818.

Terms

a(0) =1a(1) =0a(2) =-1a(3) =-1a(4) =-9a(5) =-5a(6) =-21a(7) =-21a(8) =-197a(9) =-117a(10) =-427a(11) =-427a(12) =-2501a(13) =-1797a(14) =-2909a(15) =-2909a(16) =-72877a(17) =-65453