# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a252632 Showing 1-1 of 1 %I A252632 #5 Dec 19 2014 11:26:54 %S A252632 572,1684,12840,95904,2641643,101563107,1669555189,288820014768, %T A252632 55492673837676,1690135439315021,1875667003386936703, %U A252632 1685749221369593646127,88842428411400555382137 %N A252632 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7 %C A252632 Diagonal of A252640 %H A252632 R. H. Hardin, Table of n, a(n) for n = 1..19 %e A252632 Some solutions for n=4 %e A252632 ..1..2..0..2..2..0....0..3..1..3..0..1....2..2..0..2..2..0....2..2..3..2..2..3 %e A252632 ..0..2..2..3..2..2....0..2..2..3..2..2....1..3..0..1..3..0....0..2..2..3..2..2 %e A252632 ..0..1..3..3..1..0....2..3..2..2..3..2....2..3..2..2..3..2....0..1..3..3..1..0 %e A252632 ..2..2..3..2..2..0....3..0..1..3..3..1....2..2..3..2..2..3....2..2..3..2..2..3 %e A252632 ..3..2..2..0..2..2....3..2..2..0..2..2....1..0..3..1..0..3....3..2..2..0..2..2 %e A252632 ..3..1..3..3..1..0....2..0..2..2..3..2....2..0..2..2..0..2....0..1..3..3..1..0 %K A252632 nonn %O A252632 1,1 %A A252632 _R. H. Hardin_, Dec 19 2014 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE