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A201617 Number of n X n 0..3 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor 0

%I #6 Dec 18 2015 18:17:56

%S 0,16,378,91223,136175057,1492809994673

%N Number of n X n 0..3 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor

%C Diagonal of A201625

%e Some solutions for n=4

%e ..0..0..3..3....0..0..0..1....0..0..1..1....0..0..1..1....0..0..2..2

%e ..2..2..1..3....0..2..3..1....1..2..2..2....0..3..0..1....3..3..1..1

%e ..2..2..1..3....1..2..3..1....1..2..3..3....0..3..0..2....3..3..1..2

%e ..3..3..1..1....1..2..3..3....3..3..1..1....1..1..0..2....3..3..2..2

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 03 2011

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)