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A223020 Number of n X 4 0..2 arrays with every row having the same least squares slope fit to a straight line, and every column the same least squares slope fit to a straight line, with a single point array taken as having zero slope. 1

%I

%S 81,115,739,1365,13997,35571,468409,1445055,21226859,73973931,

%T 1148109637,4289486945,68628631487,267714393779,4363979828661,

%U 17495451002837,288742958413869,1179160655695485,19640515026470277,81257674712215213

%N Number of n X 4 0..2 arrays with every row having the same least squares slope fit to a straight line, and every column the same least squares slope fit to a straight line, with a single point array taken as having zero slope.

%C Column 4 of A223022.

%H R. H. Hardin, <a href="/A223020/b223020.txt">Table of n, a(n) for n = 1..23</a>

%e Some solutions for n=3:

%e ..2..0..2..1....2..0..2..2....0..1..2..1....1..0..0..1....0..1..1..0

%e ..1..1..0..1....1..2..1..2....1..1..2..2....1..1..1..1....2..0..0..2

%e ..2..0..2..1....2..0..2..2....0..1..2..1....2..1..1..2....0..1..1..0

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 11 2013

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Last modified October 3 09:59 EDT 2022. Contains 357231 sequences. (Running on oeis4.)