A223097 - OEIS

A223097

Number of n X n 0..2 arrays with exactly floor(n X n/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

%I #5 Dec 18 2015 18:18:29

%S 1,6,546,737254,5423134897,460895553576913,178267875091681095647,

%T 831156761247263067556854883,16574854310429531539559558547925220

%N Number of n X n 0..2 arrays with exactly floor(n X n/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

%C Diagonal of A223104

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 14 2013