A213696 - OEIS

%I #3 Jun 18 2012 07:03:34

%S 240,105856,342943680,8159542628448,1425762604012263360,

%T 1829651398830137742302620

%N Half the number of (n+1)X(n+1) symmetric 0..7 arrays with no 2X2 subblock summing to 14

%C Column 7 of A213697

%e Some solutions for n=4

%e ..0..0..7..0..4....4..0..7..0..1....0..2..3..7..0....0..4..1..2..0

%e ..0..1..5..1..7....0..1..2..4..2....2..1..2..3..2....4..3..3..4..5

%e ..7..5..4..7..2....7..2..6..1..4....3..2..7..5..1....1..3..0..5..2

%e ..0..1..7..4..4....0..4..1..7..6....7..3..5..1..0....2..4..5..1..5

%e ..4..7..2..4..3....1..2..4..6..2....0..2..1..0..7....0..5..2..5..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 18 2012