Alternating sum of the numbers in the trajectory of n for the 3x+1 problem.

Terms

a(0) =1a(1) =1a(2) =-13a(3) =3a(4) =-6a(5) =19a(6) =-24a(7) =5a(8) =19a(9) =16a(10) =-9a(11) =-7a(12) =-23a(13) =38a(14) =-212a(15) =11a(16) =14a(17) =-1a(18) =-85a(19) =4a(20) =-22a(21) =31a(22) =-181a(23) =31a(24) =72a(25) =49a(26) =-21488a(27) =-10a(28) =-46a(29) =242