Triangle of successive recurrences in columns of A117317(n).

Terms

a(0) =2a(1) =4a(2) =-4a(3) =6a(4) =-12a(5) =8a(6) =8a(7) =-24a(8) =32a(9) =-16a(10) =10a(11) =-40a(12) =80a(13) =-80a(14) =32a(15) =12a(16) =-60a(17) =160a(18) =-240a(19) =192a(20) =-64a(21) =14a(22) =-84a(23) =280a(24) =-560a(25) =672a(26) =-448a(27) =128a(28) =16a(29) =-112