A220146 Number of n X n arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 n X n array

3, 11, 77, 1174, 34959, 3057777, 822242009, 671848868714

Offset

1,1

Comments

Diagonal of A220153

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3
..0..0..1....1..0..0....0..0..0....0..0..0....0..0..1....0..0..0....2..1..1
..0..0..0....1..0..0....1..0..0....0..0..0....0..0..0....1..1..0....2..1..1
..2..2..0....2..1..1....1..0..0....2..2..0....1..1..0....2..1..2....2..2..2

Crossrefs

Sequence in context: A196691 A197064 A117765 * A046153 A163856 A232468

Adjacent sequences: A220143 A220144 A220145 * A220147 A220148 A220149

Keyword

nonn

Author

R. H. Hardin Dec 06 2012

Status

approved