A154589 a(n)=A154570(n)+A154570(n+1).

4, -1, -2, -4, -8, -16, -32, -64, -128, -256, -512, -1024, -2048, -4096, -8192, -16384, -32768, -65536

Offset

0,1

Links

Table of n, a(n) for n=0..17.

Formula

G.f.: (4-9x)/(1-2x). a(n+1)= -A000079(n). R. J. Mathar, Feb 25 2009

E.g.f.: 5 + x/(G(0)+1), where G(k) = 2*k - 1 - x/(1 + x/G(k+1) ); (continued fraction ). - Sergei N. Gladkovskii, Dec 27 2013

Crossrefs

Sequence in context: A082903 A258770 A225815 * A354104 A188931 A125560

Adjacent sequences: A154586 A154587 A154588 * A154590 A154591 A154592

Keyword

sign,easy

Author

Paul Curtz, Jan 12 2009

Extensions

Edited by N. J. A. Sloane, Jan 14 2009

Status

approved