|
| |
|
|
A129392
|
|
Triangle read by rows: T(r,c)=T(r,c-1)+T(r,c+1)+T(r-1,c-1).
|
|
5
| |
|
|
1, 1, 3, 1, 1, -5, -7, -5, 1, 1, 7, 5, 3, 5, 7, 1, 1, 3, 1, -9, -15, -9, 1, 3, 1, 1, -33, -35, -5, 29, 43, 29, -5, -35, -33, 1, 1, 91, 89, 31, -23, -49, -55, -49, -23, 31, 89, 91, 1, 1, -137, -139, -93, -43, 19, 85, 115, 85, 19, -43, -93, -139, -137, 1, 1, 51, 49, 135, 225, 183, 1, -201, -287, -201, 1, 183, 225, 135, 49, 51, 1, 1, 399
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,3
|
|
|
COMMENTS
| All edge elements are 1 and the triangle is symmetric about the central line. For all elements x inside the triangle
..a..
.bxc.
we have x=a+b+c. The triangle is symmetric. The top of the triangle thus is
........1
.....1..3..1
..1.-5.-7.-5..1
1..7..5..3..5..7..1
|
|
|
LINKS
| R. J. Mathar, Comments on A129392, A129394 and A129396
R. J. Mathar, OEIS A129392 (PDF).
|
|
|
CROSSREFS
| Cf. A129393, A129394, A129396, A129398.
Sequence in context: A099608 A047969 A047812 * A118538 A141523 A201588
Adjacent sequences: A129389 A129390 A129391 * A129393 A129394 A129395
|
|
|
KEYWORD
| sign,tabf
|
|
|
AUTHOR
| Jonas Wallgren (jonwa(AT)ida.liu.se), Apr 13 2007
|
|
|
EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 17 2008
|
| |
|
|
