Bisection of A002470.

Terms

a(0) =1a(1) =-8a(2) =10a(3) =80a(4) =-231a(5) =-248a(6) =1466a(7) =-80a(8) =-4766a(9) =1944a(10) =9600a(11) =-2704a(12) =-15525a(13) =-3984a(14) =25498a(15) =10816a(16) =-29760a(17) =800a(18) =1994a(19) =-11728a(20) =29362a(21) =-5560a(22) =-2310a(23) =-1952a(24) =21649a(25) =38128a(26) =-192854a(27) =-2480a(28) =233280a(29) =-20248