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A194499 Number of lower triangles of an n X n 0..2 array with each element unequal to the sum mod 3 of its horizontal and vertical neighbors 0
2, 8, 72, 1020, 32768, 2097152, 268460064, 68721573888, 35184372088832, 36028797020012544 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A194505

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for 3X3

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

..0.0....2.0....0.0....2.0....2.1....2.2....2.2....1.2....2.0....0.2....2.1

..1.2.0..2.2.1..0.1.2..0.2.0..2.1.0..1.1.0..1.1.2..1.2.0..0.2.1..2.1.2..1.1.0

CROSSREFS

Sequence in context: A296629 A026739 A060635 * A009478 A038057 A107270

Adjacent sequences:  A194496 A194497 A194498 * A194500 A194501 A194502

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 27 2011

STATUS

approved

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Last modified May 24 22:34 EDT 2022. Contains 354047 sequences. (Running on oeis4.)