Even bisection of A347115.

Terms

a(0) =4a(1) =10a(2) =5a(3) =30a(4) =118a(5) =12a(6) =236a(7) =90a(8) =64a(9) =240a(10) =594a(11) =36a(12) =830a(13) =480a(14) =-116a(15) =270a(16) =1428a(17) =132a(18) =1784a(19) =720a(20) =1076a(21) =1200a(22) =2622a(23) =108a(24) =144a(25) =1680a(26) =458a(27) =1440a(28) =4178a(29) =-228