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A203493 Number of 3Xn 0..2 arrays with row sums equal and column sums unequal to adjacent columns 1
3, 36, 624, 9540, 170868, 3171708, 59683122, 1152091884, 22554305502, 446374660920, 8921216076156, 179685599410440, 3642895093030506, 74273800555695024, 1521731710882139544, 31310362607335978500 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A203491

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..50

EXAMPLE

Some solutions for n=5

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

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

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

CROSSREFS

Sequence in context: A291096 A234869 A305991 * A296098 A224256 A223912

Adjacent sequences:  A203490 A203491 A203492 * A203494 A203495 A203496

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 02 2012

STATUS

approved

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Last modified February 27 07:05 EST 2020. Contains 332299 sequences. (Running on oeis4.)