|
Search: id:A132780
|
|
| |
|
| 1, 1, 1, 1, 3, 7, 15, 29, 57, 113, 227, 455, 911, 1821, 3641, 7281, 14563, 29127, 58255, 116509, 233017, 466033, 932067, 1864135, 3728271, 7456541, 14913081, 29826161, 59652323, 119304647, 238609295, 477218589, 954437177, 1908874353, 3817748707
(list; graph; listen)
|
|
|
OFFSET
|
0,5
|
|
|
COMMENT
|
The first member of the sequences of the d'-th differences (that is, the diagonal of the pyramidal arrangement of repeated differences, and essentially the binomial transform of 2*A113405) has the same absolute value as the 1st differences themselves, cf. the comment in A113405.
|
|
FORMULA
|
First differences: a(n+1)-a(n)= 2*A113405(n).
O.g.f.: (1-x-x^2)/((1+x)(1-x+x^2)(1-2x)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 16 2008
|
|
CROSSREFS
|
Adjacent sequences: A132777 A132778 A132779 this_sequence A132781 A132782 A132783
Sequence in context: A009859 A122768 A023608 this_sequence A018087 A080011 A120538
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Paul Curtz (bpcrtz(AT)free.fr), Nov 17 2007
|
|
EXTENSIONS
|
Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 16 2008
|
|
|
Search completed in 0.002 seconds
|
