A238990 - OEIS

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A238990

Number of n X n 0..3 arrays with no element equal to two plus the sum of elements to its left or two plus the sum of the elements above it, modulo 4

3, 41, 2365, 638779, 860394281, 5929702056895, 212231595626785699, 39651723245559240187169, 38780926340204177325324747343

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OFFSET

1,1

COMMENTS

Diagonal of A238997

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A147797 A139161 A262644 * A192888 A239039 A228456

Adjacent sequences: A238987 A238988 A238989 * A238991 A238992 A238993

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 08 2014

STATUS

approved