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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A252524 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 3 6 or 7.

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%I A252524 #6 Jun 02 2025 11:19:53
%S A252524 750,337,466,790,4420,13184,25280,433664,1580032,3235840,191758336,
%T A252524 781844480,1656750080,363528716288,1573635751936,3393024163840,
%U A252524 2862166206054400
%N A252524 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 3 6 or 7.
%C A252524 Diagonal of A252532
%e A252524 Some solutions for n=4
%e A252524 ..0..1..1..0..1..1....0..3..0..0..3..0....2..0..0..2..0..0....3..1..2..3..2..2
%e A252524 ..0..2..0..0..3..3....1..1..0..1..1..0....1..0..1..1..0..1....3..1..3..3..0..0
%e A252524 ..1..1..0..1..1..0....0..1..1..0..1..1....1..1..0..1..1..0....2..2..3..2..2..3
%e A252524 ..0..1..1..0..1..1....0..3..0..0..2..0....2..0..0..2..0..0....3..2..2..3..2..2
%e A252524 ..0..2..0..0..2..0....1..1..0..1..1..0....1..0..1..1..0..1....0..0..3..3..1..3
%e A252524 ..1..1..0..1..1..0....0..1..1..0..2..1....1..1..0..1..1..0....2..2..3..2..1..3
%K A252524 nonn
%O A252524 1,1
%A A252524 _R. H. Hardin_, Dec 18 2014

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