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A240035
Number of nX4 0..2 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 zero plus the sum of the elements diagonally to its northwest, modulo 3
1
4, 4, 16, 18, 52, 62, 162, 204, 530, 672, 1736, 2198, 5706, 7202, 18780, 23604, 61718, 77292, 202468, 252872, 663072, 826512, 2168300, 2698978, 7082068, 8806712, 23110072, 28718278, 75360086, 93603560, 245616936, 304976256, 800224510
OFFSET
1,1
COMMENTS
Column 4 of A240039
LINKS
FORMULA
Empirical: a(n) = 11*a(n-2) -49*a(n-4) +117*a(n-6) -177*a(n-8) +214*a(n-10) -239*a(n-12) +207*a(n-14) -135*a(n-16) +108*a(n-18) -82*a(n-20) +29*a(n-22) -3*a(n-24) for n>27
EXAMPLE
Some solutions for n=3
..2..1..2..1....1..2..2..1....2..1..2..1....1..2..1..2....1..2..1..2
..1..0..0..0....2..0..0..0....1..0..0..0....2..0..0..0....2..0..0..0
..1..2..1..2....2..0..0..0....1..2..1..0....2..1..2..1....2..1..2..0
CROSSREFS
Sequence in context: A231940 A129884 A137725 * A321677 A223819 A082649
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 31 2014
STATUS
approved