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 A186171 Number of (n+2)X(n+2) 0..5 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order 1

%I #6 Mar 31 2012 12:36:05

%S 520017,311128593,188034884094,111203560772547,63117570540037053,

%T 34184079614729409659,17695100284866122677270,

%U 8806300375583656355791730,4233722976051532579394137546,1964837017618166811806637674433

%N Number of (n+2)X(n+2) 0..5 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order

%C Diagonal of A186180

%H R. H. Hardin, <a href="/A186171/b186171.txt">Table of n, a(n) for n = 1..11</a>

%e Some solutions for 4X4

%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0

%e ..0..0..0..3....0..0..0..3....0..0..0..3....0..0..0..0....0..0..0..0

%e ..1..1..1..5....0..0..1..1....0..1..2..5....0..1..4..5....0..1..2..3

%e ..1..1..2..5....0..3..1..0....5..3..5..4....0..4..4..0....0..4..4..5

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 13 2011

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Last modified September 29 05:25 EDT 2023. Contains 365757 sequences. (Running on oeis4.)