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 A223120 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order 1

%I #4 Mar 15 2013 05:28:02

%S 1,10,72,664,5376,47968,406400,3585408,30987264,272565760,2378450944,

%T 20921604096,183506403328,1615798558720,14215745994752,

%U 125323120574464,1104802314190848,9750937675890688,86084069811027968,760548158573379584

%N Number of nX2 0..2 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

%C Column 2 of A223126

%H R. H. Hardin, <a href="/A223120/b223120.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 15 2013

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Last modified June 9 18:19 EDT 2023. Contains 363183 sequences. (Running on oeis4.)