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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.

A223821 Number of nX4 0..3 arrays with every row and column least squares fitting to a zero slope straight line, with a single point array taken as having zero slope.

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%I A223821 #5 Jul 23 2025 04:34:07
%S A223821 22,22,484,744,25080,45000,2551604,4923882,362643556,760921872,
%T A223821 67380659016,143668888998,14708225919640,31720212766700,
%U A223821 3619610990119432
%N A223821 Number of nX4 0..3 arrays with every row and column least squares fitting to a zero slope straight line, with a single point array taken as having zero slope.
%C A223821 Column 4 of A223824
%e A223821 Some solutions for n=4
%e A223821 ..0..3..0..1....0..3..3..0....2..0..0..2....0..3..0..1....3..3..3..3
%e A223821 ..1..1..1..1....3..0..0..3....3..3..3..3....1..3..3..1....2..0..0..2
%e A223821 ..1..1..1..1....3..0..0..3....3..0..0..3....1..3..3..1....2..3..3..2
%e A223821 ..0..3..0..1....0..3..3..0....2..1..1..2....0..3..0..1....3..2..2..3
%K A223821 nonn
%O A223821 1,1
%A A223821 _R. H. Hardin_ Mar 27 2013

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