First differences of A138380. Second differences of A138377.

Terms

a(0) =1a(1) =-3a(2) =-1a(3) =-2a(4) =-4a(5) =12a(6) =4a(7) =8a(8) =16a(9) =-48a(10) =-16a(11) =-32a(12) =-64a(13) =192a(14) =64a(15) =128a(16) =256a(17) =-768a(18) =-256a(19) =-512a(20) =-1024a(21) =3072a(22) =1024a(23) =2048a(24) =4096a(25) =-12288a(26) =-4096a(27) =-8192a(28) =-16384a(29) =49152