OFFSET
2,4
COMMENTS
Row sums give A000142, n >= 2.
LINKS
FindStat - Combinatorial Statistic Finder, The number of regions of inversion arrangement of a permutation.
EXAMPLE
Triangle begins:
1,1,
1,2,0,2,0,1,
1,3,0,5,0,2,0,4,0,0,0,4,0,1,0,0,0,3,0,0,0,0,0,1,
...
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Christian Stump, Oct 19 2015
STATUS
approved