OFFSET
0,6
COMMENTS
The rows are symmetric: a(n,k) = a(n,2n-k).
Starting with n=7, the rows are not unimodal.
LINKS
Thomas J. Savitsky, Enumeration of 2-polymatroids on up to seven elements. SIAM J. Discrete Math., 28(4):1641-1650, 2014. arXiv:1401.8006
EXAMPLE
Triangle starts with:
n=0: 1
n=1: 1 1 1
n=2: 1 2 4 2 1
n=3: 1 3 10 12 10 3 1
n=4: 1 4 21 49 78 49 21 4 1
n=5: 1 5 39 172 584 778 584 172 39 5 1
n=6: 1 6 68 573 5236 18033 46661 18033 5236 573 68 6 1
n=7: 1 7 112 1890 72205 971573 149636721 19498369 149636721 971573 72205 1890 112 7 1
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Max Alekseyev, Mar 16 2015
STATUS
approved