OFFSET
0,6
LINKS
Alois P. Heinz, Rows n = 0..10, flattened
R. P. Stanley, On the number of reduced decompositions of elements of Coxeter groups, European J. Combin., 5 (1984), 359-372.
FORMULA
T(n,n*(n-1)/2) = A005118(n).
EXAMPLE
Triangle T(n,k) begins:
1;
1;
1, 1;
1, 2, 2, 2;
1, 3, 6, 10, 14, 16, 16;
1, 4, 12, 30, 68, 132, 252, 412, 614, 768, 768;
...
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Alois P. Heinz, Jul 12 2017
STATUS
approved