A (3/2,-1) Somos-4 sequence.

Terms

a(0) =1a(1) =1a(2) =-2a(3) =-8a(4) =-16a(5) =-16a(6) =32a(7) =128a(8) =256a(9) =256a(10) =-512a(11) =-2048a(12) =-4096a(13) =-4096a(14) =8192a(15) =32768a(16) =65536a(17) =65536a(18) =-131072a(19) =-524288a(20) =-1048576a(21) =-1048576a(22) =2097152a(23) =8388608a(24) =16777216a(25) =16777216a(26) =-33554432a(27) =-134217728a(28) =-268435456a(29) =-268435456