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A239811 Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it, modulo 4 0
2, 23, 1480, 510748, 884977259, 8243207656791, 399696014140196630, 102140919909434198721245, 136329092264192919129397551406 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A239819

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A266992 A079480 A239398 * A082963 A083759 A240563

Adjacent sequences:  A239808 A239809 A239810 * A239812 A239813 A239814

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 27 2014

STATUS

approved

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Last modified July 5 19:02 EDT 2020. Contains 335473 sequences. (Running on oeis4.)