OFFSET
1,4
LINKS
M. Josuat-Verges, J.-C. Novelli and J.-Y. Thibon, The algebraic combinatorics of snakes, arXiv preprint arXiv:1110.5272, 2011
EXAMPLE
Triangle begins:
0
1 1
2 1 0
17 19 20 20
76 59 40 20 0
...
CROSSREFS
KEYWORD
AUTHOR
N. J. A. Sloane, Dec 23 2011
STATUS
approved