cp's OEIS Frontend

A213696 Half the number of (n+1)X(n+1) symmetric 0..7 arrays with no 2X2 subblock summing to 14.

%I A213696 #5 Jun 02 2025 08:03:40
%S A213696 240,105856,342943680,8159542628448,1425762604012263360,
%T A213696 1829651398830137742302620
%N A213696 Half the number of (n+1)X(n+1) symmetric 0..7 arrays with no 2X2 subblock summing to 14.
%C A213696 Column 7 of A213697
%e A213696 Some solutions for n=4
%e A213696 ..0..0..7..0..4....4..0..7..0..1....0..2..3..7..0....0..4..1..2..0
%e A213696 ..0..1..5..1..7....0..1..2..4..2....2..1..2..3..2....4..3..3..4..5
%e A213696 ..7..5..4..7..2....7..2..6..1..4....3..2..7..5..1....1..3..0..5..2
%e A213696 ..0..1..7..4..4....0..4..1..7..6....7..3..5..1..0....2..4..5..1..5
%e A213696 ..4..7..2..4..3....1..2..4..6..2....0..2..1..0..7....0..5..2..5..0
%K A213696 nonn
%O A213696 1,1
%A A213696 _R. H. Hardin_ Jun 18 2012