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 A186831 Number of (n+2)X(n+2) binary arrays with 3X3 subblock sums nondecreasing rightwards and downwards. 0
 512, 19904, 1537476, 209888936, 21242244160, 3176962520030 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A186840 LINKS Table of n, a(n) for n=1..6. EXAMPLE Some solutions for 4X4 ..1..0..1..0....1..0..1..0....1..1..0..0....0..0..0..0....1..1..0..1 ..1..0..0..1....0..0..1..1....0..0..1..1....0..0..0..1....0..0..0..1 ..0..0..0..1....1..1..1..1....0..1..1..0....1..0..0..0....1..1..0..0 ..1..1..0..1....1..1..0..1....1..1..0..0....1..1..1..1....0..1..1..0 CROSSREFS Sequence in context: A231308 A254735 A254914 * A236215 A254182 A253954 Adjacent sequences: A186828 A186829 A186830 * A186832 A186833 A186834 KEYWORD nonn AUTHOR R. H. Hardin, Feb 27 2011 STATUS approved

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Last modified July 20 09:46 EDT 2024. Contains 374445 sequences. (Running on oeis4.)