First differences of A135351.

Terms

a(0) =0a(1) =2a(2) =-2a(3) =3a(4) =-1a(5) =5a(6) =3a(7) =13a(8) =19a(9) =45a(10) =83a(11) =173a(12) =339a(13) =685a(14) =1363a(15) =2733a(16) =5459a(17) =10925a(18) =21843a(19) =43693a(20) =87379a(21) =174765a(22) =349523a(23) =699053a(24) =1398099a(25) =2796205a(26) =5592403a(27) =11184813a(28) =22369619a(29) =44739245