OFFSET
1,2
COMMENTS
REFERENCES
P. Curtz, Stabilite locale des systemes quadratiques. Ann. sc. Ecole Normale Sup., 1980, 293-302.
FORMULA
T(n,m) = n-m+1 for 1 <= m <= n. T(n,m) = 2n-m for n< m <= 2n-1. [R. J. Mathar, Nov 24 2010]
sum_{m=1..2n-1} T(n,m) = n^2.
EXAMPLE
1;
2,1,1;
3,2,1,2,1;
4,3,2,1,3,2,1;
5,4,3,2,1,4,3,2,1;
MATHEMATICA
Flatten[ Table[ Range[k, 1, -1], {n, 1, 10}, {k, {n, n-1}}]] (* Jean-François Alcover, Aug 02 2012 *)
CROSSREFS
KEYWORD
nonn,easy,tabf
AUTHOR
Paul Curtz, Sep 06 2009
STATUS
approved