OFFSET
-1,7
LINKS
Eriko Hironaka, Salem-Boyd sequences and Hopf plumbing, Osaka J. Math. Volume 43, Number 3 (2006), 497-516.
Eriko Hironaka, Salem-Boyd sequences and Hopf plumbing, arXiv:math/0506602 [math.GT], 2005.
FORMULA
Sum_{k=0..n+2} = 2*A033999(n+2).
EXAMPLE
Triangle begins:
-1, -1;
0, 1, 1;
0, -2, -1, 1;
0, 2, 0, -1, 1;
0, -2, 0, 0, -1, 1;
0, 2, 0, 0, 0, -1, 1;
0, -2, 0, 0, 0, 0, -1, 1;
0, 2, 0, 0, 0, 0, 0, -1, 1;
0, -2, 0, 0, 0, 0, 0, 0, -1, 1;
0, 2, 0, 0, 0, 0, 0, 0, 0, -1, 1;
0, -2, 0, 0, 0, 0, 0, 0, 0, 0, -1, 1;
0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 1;
...
MATHEMATICA
p[x_, n_] = x*(x^n*(x - 1) + (-1)^n*2);
Table[CoefficientList[p[x, n], x], {n, -1, 10}]//Flatten
PROG
(Maxima) T(n, k) := ratcoef(x*(x^n*(x - 1) + (-1)^n*2), x, k)$
create_list(T(n, k), n, -1, 10, k, 0, n + 2); /* Franck Maminirina Ramaharo, Nov 02 2018 */
CROSSREFS
KEYWORD
sign,tabf
AUTHOR
Roger L. Bagula and Gary W. Adamson, Oct 23 2008
EXTENSIONS
Edited name, Joerg Arndt, May 26 2013
Offset corrected by Michel Marcus, May 27 2013
STATUS
approved