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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A229412

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences:  A229404 A229405 A229406 * A229408 A229409 A229410

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 22 2013

STATUS

approved

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Last modified November 29 11:36 EST 2020. Contains 338765 sequences. (Running on oeis4.)