A238767 Number of n X n 0..3 arrays with no element equal to the sum modulo 4 of elements to its left or elements above it

3, 30, 1888, 604412, 976810146, 8524103612876, 384784855475971422, 91451636241199973001868, 113848681754675491485349305798

Offset

1,1

Comments

Diagonal of A238775

Links

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

Example

Some solutions for n=3
..3..2..3....1..2..2....1..3..2....3..1..2....3..1..2....1..2..1....1..2..1
..2..0..1....3..1..1....3..1..3....1..0..3....1..0..3....2..0..0....3..0..0
..2..3..3....2..1..2....1..2..2....1..0..0....1..3..3....1..0..0....2..1..0

Crossrefs

Sequence in context: A341499 A203415 A203520 * A323819 A308228 A208789

Adjacent sequences: A238764 A238765 A238766 * A238768 A238769 A238770

Keyword

nonn

Author

R. H. Hardin, Mar 05 2014

Status

approved