A205207 Number of (n+1)X(n+1) 0..2 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards

81, 3248, 357812, 155765726, 209120030041, 1034393632508251, 14824580873279399161, 797526323055787605352015, 123972751506684583828633136175, 70684339957802747710060180358201899

Offset

1,1

Comments

Diagonal of A205215

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=4
..2..1..0..2..1....0..2..2..0..0....1..0..0..2..2....1..0..2..2..0
..2..0..0..2..1....2..2..2..0..0....1..0..0..2..2....0..0..1..1..0
..1..0..0..1..1....2..2..2..0..0....1..0..0..2..2....2..0..1..1..0
..0..0..0..1..2....1..1..1..0..0....1..0..0..2..2....1..0..2..2..0
..1..0..0..0..1....0..0..0..0..0....2..0..0..1..1....1..0..2..2..2

Crossrefs

Sequence in context: A236894 A231768 A017797 * A254415 A017744 A232945

Adjacent sequences: A205204 A205205 A205206 * A205208 A205209 A205210

Keyword

nonn

Author

R. H. Hardin Jan 23 2012

Status

approved