First differences of A133730.

Terms

a(0) =-1a(1) =-1a(2) =2a(3) =0a(4) =0a(5) =-2a(6) =4a(7) =-2a(8) =4a(9) =-6a(10) =12a(11) =-10a(12) =20a(13) =-22a(14) =44a(15) =-42a(16) =84a(17) =-86a(18) =172a(19) =-170a(20) =340a(21) =-342a(22) =684a(23) =-682a(24) =1364a(25) =-1366a(26) =2732a(27) =-2730a(28) =5460a(29) =-5462