A204031 Number of (n+1)X(n+1) 0..1 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards

16, 164, 2928, 44366, 969528, 16895850, 397550036, 7576693894, 184631622106, 3777035543236, 93707916130348, 2028328695512904, 50826307266520194

Offset

1,1

Comments

Diagonal of A204039

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Sequence in context: A094857 A274801 A274747 * A341084 A025930 A125404

Adjacent sequences: A204028 A204029 A204030 * A204032 A204033 A204034

Keyword

nonn

Author

R. H. Hardin Jan 09 2012

Status

approved