A186906 Number of (n+2)X(n+2) 0..6 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order

2066505, 2974946682, 4813465754996, 8185872059408158, 14077041692560748494, 23991605690718487651365, 40128119810449322920431346, 65662514004587268399842833783

Offset

1,1

Comments

Diagonal of A186915

Links

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

Example

Some solutions for 4X4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..1..1..1..4....0..0..3..5....0..0..3..6....0..1..2..4....0..1..1..3
..3..4..6..6....5..6..0..6....1..5..3..6....4..6..1..0....0..1..4..1

Crossrefs

Sequence in context: A113568 A186915 A186907 * A335398 A155125 A155126

Adjacent sequences: A186903 A186904 A186905 * A186907 A186908 A186909

Keyword

nonn

Author

R. H. Hardin Feb 28 2011

Status

approved