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A186906 Number of (n+2)X(n+2) 0..6 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order 0
2066505, 2974946682, 4813465754996, 8185872059408158, 14077041692560748494, 23991605690718487651365, 40128119810449322920431346, 65662514004587268399842833783 (list; graph; refs; listen; history; text; internal format)
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

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Last modified April 15 20:40 EDT 2021. Contains 342977 sequences. (Running on oeis4.)