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A229407
Number of nX3 0..3 arrays avoiding 11 horizontally, 22 vertically, 33 antidiagonally and 00 diagonally
1
57, 1756, 53538, 1629298, 49788258, 1519840402, 46408035676, 1416912709750, 43262165219520, 1320895600914374, 40330198228444030, 1231378827675817778, 37596999339380782420, 1147927946466853457658, 35049037211821475282406
OFFSET
1,1
COMMENTS
Column 3 of A229412
LINKS
FORMULA
Empirical: a(n) = 18*a(n-1) +376*a(n-2) +224*a(n-3) -1664*a(n-4) +36983*a(n-5) -181958*a(n-6) +100599*a(n-7) +484260*a(n-8) -503501*a(n-9) -354823*a(n-10) +399643*a(n-11) +243696*a(n-12) +20412*a(n-13)
EXAMPLE
Some solutions for n=3
..1..0..1....0..0..1....3..2..2....2..0..0....1..3..0....3..1..2....3..2..0
..3..3..3....0..2..1....0..3..1....1..3..1....1..3..0....1..0..0....2..0..2
..0..2..0....2..3..2....2..3..3....0..3..1....0..0..2....1..0..1....3..3..1
CROSSREFS
Sequence in context: A009702 A282932 A228259 * A270502 A285238 A011812
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 22 2013
STATUS
approved