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A266021 Number of nX4 integer arrays with each element equal to the number of horizontal, vertical and antidiagonal neighbors exactly one smaller than itself. 1

%I

%S 5,42,91,577,3796,19688,110924,656555,3732300,21344656,123330565,

%T 708246405,4066193034,23408646708,134627655119,773992993358,

%U 4452175085918,25607065587568,147270467464058,847048745101385

%N Number of nX4 integer arrays with each element equal to the number of horizontal, vertical and antidiagonal neighbors exactly one smaller than itself.

%C Column 4 of A266025.

%H R. H. Hardin, <a href="/A266021/b266021.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

%e ..1..2..1..1....0..2..2..0....2..3..2..0....0..2..2..0....0..1..1..1

%e ..2..2..2..0....1..2..0..0....1..2..1..2....1..3..2..1....2..1..1..1

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

%Y Cf. A266025.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 20 2015

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Last modified September 20 01:53 EDT 2020. Contains 337258 sequences. (Running on oeis4.)