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A223019 Number of nX3 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 #5 Mar 11 2013 16:26:15

%S 27,45,309,739,8355,25953,347991,1229117,18018549,67909529,1046096523,

%T 4096787051,65040649449,260964444937,4226066166411,17238820837359,

%U 283096808484339,1168749542908559,19394826830524971,80809800289872123

%N Number of nX3 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 3 of A223022

%H R. H. Hardin, <a href="/A223019/b223019.txt">Table of n, a(n) for n = 1..33</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 11 2013

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Last modified March 28 13:35 EDT 2024. Contains 371254 sequences. (Running on oeis4.)