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A239979
Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4
0
1, 3, 13, 171, 7113, 652346, 226886115, 198719581101
OFFSET
1,2
COMMENTS
Diagonal of A239986
EXAMPLE
Some solutions for n=4
..3..0..0..0....3..0..0..0....3..0..0..0....3..0..0..0....3..0..0..0
..2..3..3..3....2..3..0..0....2..1..0..0....2..1..0..0....2..3..3..3
..2..0..0..3....2..0..0..0....2..0..3..0....2..0..0..3....2..0..0..3
..3..0..0..1....2..0..1..1....3..0..0..1....3..1..1..3....3..0..2..2
CROSSREFS
Sequence in context: A290758 A290769 A213794 * A336204 A261361 A114317
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 30 2014
STATUS
approved