%I #5 Jan 20 2024 18:30:42
%S -1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536,
%T 131072,262144,524288,1048576,2097152,4194304,8388608,16777216,
%U 33554432,67108864,134217728,268435456,536870912,1073741824,2147483648,4294967296,8589934592
%N Powers of 2 (A000079) with 1 changed to -1.
%Y Cf. A000079.
%K sign
%O 0,2
%A _Paul Curtz_, Dec 09 2009
%E Edited by _N. J. A. Sloane_, Dec 17 2009