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A238719 Number of n X n 0..2 arrays with no element equal to the sum modulo 3 of elements to its left or elements above it 0
2, 4, 40, 284, 11440, 296384, 43248968, 4105077596, 2157995166344, 751193181802392, 1429330959153482960, 1827061855695075169856 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A238726

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=5

..2..1..2..1..2....2..1..1..2..1....2..1..2..1..1....2..1..1..2..2

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

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

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

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

CROSSREFS

Sequence in context: A098337 A326483 A187468 * A158213 A012596 A292700

Adjacent sequences:  A238716 A238717 A238718 * A238720 A238721 A238722

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 03 2014

STATUS

approved

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Last modified September 23 12:53 EDT 2020. Contains 337310 sequences. (Running on oeis4.)