A233233 - OEIS

A233233

Number of n X n 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order

%I #5 Dec 18 2015 18:18:48

%S 1,19,18744,338046654,83262848013541,273407904115337411320,

%T 11963921132630138069523033663,6976482888479442637729140675454130898

%N Number of n X n 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order

%C Diagonal of A233239

%e Some solutions for n=3

%e ..0..1..1....0..1..2....0..1..2....0..0..1....0..1..5....0..1..2....0..1..1

%e ..2..0..1....2..1..1....2..0..2....4..0..4....2..1..0....0..1..1....1..0..0

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 06 2013