OFFSET
0,13
LINKS
C. Ahmed, P. Martin, V. Mazorchuk, On the number of principal ideals in d-tonal partition monoids, arXiv preprint arXiv:1503.06718 [math.CO], 2015. See Fig. 2.
EXAMPLE
Triangle begins:
1,
0,1,
0,1,1,
1,1,1,1,
0,1,2,1,1,
0,1,2,2,1,1,
1,1,2,3,2,1,1,
0,1,2,3,3,2,1,1,
0,1,2,3,4,3,2,1,1,
1,1,2,4,4,4,3,2,1,1,
0,1,2,3,5,5,4,3,2,1,1,
0,1,2,3,5,6,5,4,3,2,1,1,
1,1,2,4,5,6,7,5,4,3,2,1,1,
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Nov 30 2015
STATUS
approved