OFFSET
1,5
LINKS
Soheir M. Khamis, Height counting of unlabeled interval and N-free posets, Discrete Math. 275 (2004), no. 1-3, 165-175.
EXAMPLE
Triangle begins:
1
0 1
0 2 1
0 3 5 1
0 4 17 9 1
0 5 45 50 14 1
0 6 115 218 114 20 1
0 7 278 851 709 224 27 1
0 8 679 3161 3818 1867 398 35 1
0 9 1666 11507 19042 13113 4276 657 44 1
0 10 4167 41837 91383 83222 37898 8845 1025 54 1
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Dec 13 2011
STATUS
approved