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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.

A230700 Number of (n+3)X(n+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.

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%I A230700 #6 Jul 23 2025 05:57:30
%S A230700 2,28,2106,121382,43853402,13663471254,26681634560690,
%T A230700 45145901233869558,479398570293769095556,4408105907275837627631446
%N A230700 Number of (n+3)X(n+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.
%C A230700 Diagonal of A230708
%e A230700 Some solutions for n=2
%e A230700 ..0..x..2..x..2....0..x..0..x..1....0..x..2..x..2....0..x..0..x..1
%e A230700 ..x..1..x..0..x....x..1..x..2..x....x..1..x..0..x....x..1..x..2..x
%e A230700 ..0..x..2..x..1....2..x..1..x..0....0..x..1..x..2....0..x..2..x..1
%e A230700 ..x..1..x..2..x....x..0..x..1..x....x..2..x..0..x....x..2..x..0..x
%e A230700 ..0..x..0..x..1....2..x..2..x..0....1..x..1..x..2....1..x..1..x..2
%K A230700 nonn
%O A230700 1,1
%A A230700 _R. H. Hardin_, Oct 28 2013

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