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A212924
Number of n X n 0..n-1 arrays with no column j greater than column j-1 in all rows
1
1, 15, 18226, 4041974015, 285912852294921876, 10046278068363977051128904352, 252848108054080530934326716965286554552380, 6218295117529777826597449794390561827118547543121719263231
OFFSET
1,2
COMMENTS
Diagonal of A212930
LINKS
EXAMPLE
Some solutions for n=3
..0..0..1....2..2..0....0..1..2....1..0..1....1..1..1....2..1..2....1..2..1
..1..2..0....1..2..0....1..2..0....1..2..2....1..0..1....1..2..2....2..1..2
..1..2..1....2..1..0....0..0..0....2..1..2....2..1..2....1..2..0....1..0..2
CROSSREFS
Sequence in context: A198521 A373885 A354062 * A068732 A174304 A208461
KEYWORD
nonn
AUTHOR
R. H. Hardin May 31 2012
STATUS
approved