OFFSET
1,13
LINKS
Axel Bacher, Antonio Bernini, Luca Ferrari, Benjamin Gunby, Renzo Pinzani, Julian West, The Dyck pattern poset, Discrete Math. 321 (2014), 12--23. MR3154009.
EXAMPLE
Array begins (the columns correspond to k = 0, 1, 2, ..., the rows to n = 1, 2, 3, ...):
0, 0, 0, 0, 0, 0, 0, 0, 0 ...
1, 1, 1, 1, 1, 1, 1, 1, 1 ...
1, 1, 2, 4, 4, 4, 4, 4, 4 ...
1, 1, 2, 5, 13, 25, 25, 25, 25, ...
1, 1, 2, 5, 14, 41, 106, 196, ...
1, 1, 2, 5, 14, 42, 131, 392, 980, ...
1, 1, 2, 5, 14, 42, 132, 428, 1380, ...
1, 1, 2, 5, 14, 42, 132, 429, 1429, ...
1, 1, 2, 5, 14, 42, 132, 429, 1430, ...
...
CROSSREFS
KEYWORD
tabl,nonn
AUTHOR
N. J. A. Sloane, Feb 21 2014
STATUS
approved