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
The triangle begins:
0
0 0
3 3 3
0 3 6 9
147 147 144 138 129
...
The three triangles together:
0 1 0
0 0 0 1 1 1
3 3 3 3 3 2 2 1 0
0 3 6 9 9 12 15 17 17 19 20 20
147 147 144 138 129 129 120 108 93 76 76 59 40 20 0
CROSSREFS
KEYWORD
AUTHOR
N. J. A. Sloane, Dec 23 2011
STATUS
approved