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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.

A206501 Number of nX4 0..7 arrays with no element equal to another within a city block distance of two, and new values 0..7 introduced in row major order.

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%I A206501 #6 Jul 22 2025 19:29:15
%S A206501 2,34,3130,502599,83045488,13752277898,2277207309720,377099217207514,
%T A206501 62445595052884887,10340702774554689140,1712370276674504142791,
%U A206501 283560339737534813492944
%N A206501 Number of nX4 0..7 arrays with no element equal to another within a city block distance of two, and new values 0..7 introduced in row major order.
%C A206501 Column 4 of A206503
%e A206501 Some solutions for n=4
%e A206501 ..0..1..2..0....0..1..2..0....0..1..2..0....0..1..2..0....0..1..2..0
%e A206501 ..2..3..4..5....2..3..4..5....2..3..4..5....2..3..4..1....2..3..4..1
%e A206501 ..4..5..6..3....1..0..6..1....4..0..6..1....4..5..6..7....1..5..6..7
%e A206501 ..6..7..1..4....5..4..2..3....1..2..3..7....7..0..3..2....3..4..1..0
%K A206501 nonn
%O A206501 1,1
%A A206501 _R. H. Hardin_ Feb 08 2012

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