|
Search: id:A137256
|
|
|
| A137256 |
|
Binomial transform of 2^n, 2^n, 2^n. |
|
+0
3
|
|
| 1, 2, 4, 9, 21, 48, 108, 243, 549, 1242, 2808, 6345, 14337, 32400, 73224, 165483, 373977, 845154, 1909980, 4316409, 9754749, 22044960, 49819860, 112588947, 254442141, 575019162, 1299497904, 2936762649, 6636851721, 14998760928
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
Sequence is identical to half its third differences.
|
|
FORMULA
|
Also a(n)=3a(n-1)-3a(n-2)+3a(n-3), A052103.
O.g.f.: -(1-x+x^2)/(-1+3*x-3*x^2+3*x^3). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008
|
|
CROSSREFS
|
Cf. A051164.
Sequence in context: A061439 A027711 A084634 this_sequence A051164 A101891 A119967
Adjacent sequences: A137253 A137254 A137255 this_sequence A137257 A137258 A137259
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Paul Curtz (bpcrtz(AT)free.fr), Mar 11 2008
|
|
EXTENSIONS
|
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008
|
|
|
Search completed in 0.002 seconds
|
