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 3 6 3 1
n=3: 1 7 29 41 29 7 1
n=4: 1 15 135 477 784 477 135 15 1
n=5: 1 31 642 5957 27375 41695 27375 5957 642 31 1
n=6: 1 63 3199 87477 1554077 7109189 21937982 7109189 1554077 87477 3199 63 1
n=7: 1 127 16879 1604768 189213842 3559635761 733133160992 86322358307 733133160992 3559635761 189213842 1604768 16879 127 1
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Max Alekseyev, Mar 16 2015
STATUS
approved