Sequence identical to its third differences in absolute values.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =24a(6) =40a(7) =80a(8) =120a(9) =200a(10) =400a(11) =600a(12) =1000a(13) =2000a(14) =3000a(15) =5000a(16) =10000a(17) =15000a(18) =25000a(19) =50000a(20) =75000a(21) =125000a(22) =250000a(23) =375000a(24) =625000a(25) =1250000a(26) =1875000a(27) =3125000a(28) =6250000a(29) =9375000