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A201538 Number of nX7 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor 1

%I #5 Mar 31 2012 12:36:44

%S 18,899,72811,9526987,1408677515,208164634003,28456420346436,

%T 3505159734744220,387870239576486118,38812326822498760643,

%U 3543738686502556683539,297838575975499416278867

%N Number of nX7 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor

%C Column 7 of A201539

%H R. H. Hardin, <a href="/A201538/b201538.txt">Table of n, a(n) for n = 1..14</a>

%e Some solutions for n=3

%e ..0..0..0..0..0..0..0....0..0..0..0..1..1..1....0..0..1..1..1..2..2

%e ..0..1..1..1..1..1..2....0..0..0..1..1..2..2....1..1..2..2..2..1..2

%e ..1..1..1..2..2..2..2....2..2..2..0..0..1..1....2..2..0..0..0..1..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 02 2011

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Last modified April 25 08:25 EDT 2024. Contains 371964 sequences. (Running on oeis4.)