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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.

A230707 Number of (n+3)X(7+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 A230707 #6 Jul 23 2025 05:58:04
%S A230707 3956,173428,8053490,342031378,14669811856,625553036008,
%T A230707 26681634560690,1137681116923966,48508501856178526,
%U A230707 2068224674692996586,88181384650502245634,3759701430154725238638,160298702553771350622996
%N A230707 Number of (n+3)X(7+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 A230707 Column 7 of A230708
%H A230707 R. H. Hardin, <a href="/A230707/b230707.txt">Table of n, a(n) for n = 1..210</a>
%e A230707 Some solutions for n=2
%e A230707 ..0..x..0..x..2..x..1..x..1..x....0..x..1..x..1..x..2..x..1..x
%e A230707 ..x..1..x..1..x..0..x..2..x..0....x..1..x..2..x..2..x..0..x..2
%e A230707 ..0..x..2..x..2..x..0..x..2..x....2..x..1..x..0..x..1..x..0..x
%e A230707 ..x..2..x..0..x..1..x..2..x..1....x..0..x..1..x..2..x..0..x..1
%e A230707 ..1..x..1..x..0..x..0..x..0..x....2..x..2..x..1..x..1..x..2..x
%K A230707 nonn
%O A230707 1,1
%A A230707 _R. H. Hardin_, Oct 28 2013

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