cp's OEIS Frontend

A213703 Half the number of 8X8 0..n symmetric arrays with no 2X2 subblock summing to 2n.

%I A213703 #5 Jul 22 2025 23:04:23
%S A213703 1220409,109492322533385,22678299640600736258,
%T A213703 181744271406372884215557,251417716503635583550380605,
%U A213703 100056407652480771734417515110
%N A213703 Half the number of 8X8 0..n symmetric arrays with no 2X2 subblock summing to 2n.
%C A213703 Row 7 of A213697
%e A213703 Some solutions for n=4
%e A213703 ..1..3..0..2..3..4..4..3....3..0..4..4..0..2..3..0....3..4..3..0..0..1..2..3
%e A213703 ..3..2..1..3..3..4..3..4....0..4..1..1..2..1..0..0....4..3..4..2..3..0..1..4
%e A213703 ..0..1..0..0..3..0..0..0....4..1..1..4..2..4..4..3....3..4..3..3..1..3..0..2
%e A213703 ..2..3..0..3..1..0..2..2....4..1..4..3..2..3..0..4....0..2..3..2..1..4..2..3
%e A213703 ..3..3..3..1..4..4..3..4....0..2..2..2..2..0..2..1....0..3..1..1..3..1..0..1
%e A213703 ..4..4..0..0..4..2..4..1....2..1..4..3..0..4..0..1....1..0..3..4..1..4..2..3
%e A213703 ..4..3..0..2..3..4..1..1....3..0..4..0..2..0..2..4....2..1..0..2..0..2..2..3
%e A213703 ..3..4..0..2..4..1..1..0....0..0..3..4..1..1..4..0....3..4..2..3..1..3..3..4
%K A213703 nonn
%O A213703 1,1
%A A213703 _R. H. Hardin_ Jun 18 2012