A240147 Number of n X n 0..3 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4

2, 5, 20, 676, 11742, 1608415, 417799464

Offset

1,1

Comments

Diagonal of A240153

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for n=4
..2..2..3..2....2..2..3..2....2..2..3..2....2..2..3..2....3..2..3..3
..0..2..1..1....0..2..1..1....0..2..1..1....0..2..1..1....3..1..2..2
..2..2..2..2....2..0..2..3....2..0..0..1....2..2..3..3....2..2..0..3
..3..2..0..1....0..0..0..2....2..2..3..3....0..2..1..1....2..0..0..2

Crossrefs

Sequence in context: A006893 A003163 A088498 * A358556 A293687 A190117

Adjacent sequences: A240144 A240145 A240146 * A240148 A240149 A240150

Keyword

nonn

Author

R. H. Hardin, Apr 02 2014

Status

approved