login
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one diagonal or antidiagonal neighbor and the top left element equal to 0.
0

%I #5 Aug 12 2016 06:54:17

%S 0,6,6,672,4734,177048,4131792,132137160,4330697670,144754955796

%N Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one diagonal or antidiagonal neighbor and the top left element equal to 0.

%C Row 4 of A268142.

%e Some solutions for n=4

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

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

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

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

%Y Cf. A268142.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 27 2016