cp's OEIS Frontend

A213702 Half the number of 7X7 0..n symmetric arrays with no 2X2 subblock summing to 2n.

%I A213702 #6 Jul 24 2025 19:39:29
%S A213702 68798,88681187619,1146407046198040,1199143411128185584,
%T A213702 325754552781442854792,33704464361612549676417,
%U A213702 1829651398830137742302620,59594337869095766240501287,1329775905386553460207679334
%N A213702 Half the number of 7X7 0..n symmetric arrays with no 2X2 subblock summing to 2n.
%C A213702 Row 6 of A213697
%H A213702 R. H. Hardin, <a href="/A213702/b213702.txt">Table of n, a(n) for n = 1..10</a>
%e A213702 Some solutions for n=4
%e A213702 ..0..1..2..3..3..4..2....4..2..1..3..0..1..4....4..4..2..1..4..1..0
%e A213702 ..1..3..0..1..4..3..3....2..2..4..3..0..0..1....4..1..2..0..4..0..3
%e A213702 ..2..0..0..3..4..2..2....1..4..2..4..2..3..0....2..2..1..0..0..0..2
%e A213702 ..3..1..3..1..4..1..4....3..3..4..1..3..4..4....1..0..0..3..2..0..3
%e A213702 ..3..4..4..4..3..1..0....0..0..2..3..4..4..3....4..4..0..2..3..4..3
%e A213702 ..4..3..2..1..1..1..3....1..0..3..4..4..4..3....1..0..0..0..4..1..2
%e A213702 ..2..3..2..4..0..3..2....4..1..0..4..3..3..0....0..3..2..3..3..2..0
%K A213702 nonn
%O A213702 1,1
%A A213702 _R. H. Hardin_ Jun 18 2012