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A203033 Number of 3Xn 0..3 arrays with row sums equal and column sums unequal to adjacent columns 1
4, 120, 4740, 191208, 8536230, 396419436, 18828234948, 912456343092, 44877327059082, 2232846723233916, 112156061708925570, 5678174300220035688, 289386692411558932884, 14832527343262783621824, 763984636989973669144320 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A203031

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some.solutions.for.n=5

..2..3..0..3..2....1..2..0..0..3....3..2..3..3..2....2..0..1..1..0

..2..1..1..3..3....0..0..3..1..2....3..1..3..3..3....3..0..0..0..1

..3..1..2..1..3....3..0..2..0..1....3..2..2..3..3....1..0..0..1..2

CROSSREFS

Sequence in context: A240397 A002702 A068204 * A001332 A071304 A213957

Adjacent sequences:  A203030 A203031 A203032 * A203034 A203035 A203036

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 27 2011

STATUS

approved

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Last modified November 17 08:17 EST 2018. Contains 317275 sequences. (Running on oeis4.)