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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.

A209526 Number of nX7 0..7 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..7 introduced in row major order.

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%I A209526 #6 Jul 22 2025 21:48:13
%S A209526 877,4054358,71519658191,2002617518101082,64398780661554524050,
%T A209526 2141993311657850070458667
%N A209526 Number of nX7 0..7 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..7 introduced in row major order.
%C A209526 Column 7 of A209527
%e A209526 Some solutions for n=5
%e A209526 ..0..0..0..0..0..1..0....0..0..0..0..0..0..0....0..0..0..0..1..2..0
%e A209526 ..1..2..1..2..1..2..0....1..2..1..3..1..2..1....1..2..1..3..1..4..4
%e A209526 ..1..3..2..4..2..0..1....2..3..3..0..0..0..0....0..0..2..1..4..2..0
%e A209526 ..4..1..1..2..0..3..3....0..0..1..1..2..3..1....2..3..0..2..2..0..1
%e A209526 ..0..0..2..3..3..2..0....1..4..0..2..0..2..2....1..2..2..1..3..0..3
%K A209526 nonn
%O A209526 1,1
%A A209526 _R. H. Hardin_ Mar 10 2012

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