

A239857


Number of nX7 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4


0




OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

Some solutions for n=4
..3..2..2..2..3..2..3....3..2..3..2..3..2..2....2..3..3..3..2..3..2
..2..1..0..1..2..1..0....2..1..0..1..2..1..0....3..1..2..1..1..2..3
..3..1..3..0..2..2..2....3..2..2..2..2..2..3....2..3..3..3..2..2..2
..3..2..3..2..0..0..0....3..2..2..0..0..2..2....2..1..2..0..0..2..2


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



