A137206 First differences of A074323.

0, 2, -1, 4, -2, 8, -4, 16, -8, 32, -16, 64, -32, 128, -64, 256, -128, 512, -256, 1024, -512, 2048, -1024, 4096, -2048, 8192, -4096, 16384, -8192, 32768, -16384, 65536, -32768, 131072, -65536, 262144, -131072, 524288, -262144, 1048576, -524288

Offset: 0

Author

Paul Curtz, Mar 05 2008

Keywords

• sign

Links

• Matthew House, Table of n, a(n) for n = 0..6605
• Index entries for linear recurrences with constant coefficients, signature (0,2).

Crossrefs

Cf. A000079, A131577, A135530.

Formula

From R. J. Mathar, Apr 22 2009: (Start)

G.f.: x*(2-x)/(1-2*x^2).

a(n) = (-1)^(n+1)*A135530(n-1). (End)

a(n) = 2*a(n-2). - Matthew House, Jan 15 2017

Extensions

More terms from R. J. Mathar, Apr 22 2009