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A239642 Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4 0
2, 20, 1182, 320314, 471203608, 3608789598890, 144633234041629586, 30422021680410630610470, 33561342025910573963641656948 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A239649

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A012790 A273194 A013144 * A112359 A308231 A179594

Adjacent sequences:  A239639 A239640 A239641 * A239643 A239644 A239645

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 23 2014

STATUS

approved

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Last modified September 27 03:21 EDT 2020. Contains 337380 sequences. (Running on oeis4.)