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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.

A209464 Number of nX7 0..6 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..6 introduced in row major order.

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%I A209464 #8 Jul 22 2025 21:44:33
%S A209464 877,3966581,54657856108,937020001725427,16716447554895729642,
%T A209464 300152638733732557375867
%N A209464 Number of nX7 0..6 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..6 introduced in row major order.
%C A209464 Column 7 of A209465
%e A209464 Some.solutions.for.n=4
%e A209464 ..0..0..0..0..0..1..1....0..0..0..0..0..0..0....0..0..1..0..2..3..0
%e A209464 ..1..2..1..2..1..3..4....1..2..1..2..1..2..1....1..2..0..2..1..1..3
%e A209464 ..5..5..1..3..1..4..0....3..1..4..4..1..3..1....0..0..1..0..2..3..4
%e A209464 ..6..1..0..3..4..2..2....1..4..5..3..1..6..6....3..1..2..0..4..4..0
%K A209464 nonn
%O A209464 1,1
%A A209464 _R. H. Hardin_ Mar 09 2012

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