Bisection of A002470.

Terms

a(0) =0a(1) =4a(2) =-48a(3) =224a(4) =-448a(5) =40a(6) =1408a(7) =-2240a(8) =1280a(9) =-924a(10) =-480a(11) =6944a(12) =-8704a(13) =5864a(14) =-14080a(15) =2240a(16) =33792a(17) =-19064a(18) =11088a(19) =-54432a(20) =-4480a(21) =38400a(22) =43648a(23) =75712a(24) =-124928a(25) =-62100a(26) =-70368a(27) =111552a(28) =87040a(29) =101992