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 A230830 Number of nX7 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero 1

%I

%S 0,124,456,3034,22852,201592,1807682,16202418,145774974,1316654208,

%T 11925318054,108181945306,982423923962,8927514669564,81157461251264,

%U 737931539839332,6710435168666098,61025322017165952,554987343000961892

%N Number of nX7 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero

%C Column 7 of A230831

%H R. H. Hardin, <a href="/A230830/b230830.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Oct 30 2013

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Last modified March 28 01:22 EDT 2023. Contains 361575 sequences. (Running on oeis4.)