A239593 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 or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4

2, 3, 31, 643, 38824, 12509870, 11135057785

Offset

1,1

Comments

Diagonal of A239599

Links

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

Example

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

Crossrefs

Sequence in context: A274609 A372142 A128030 * A214658 A334489 A217761

Adjacent sequences: A239590 A239591 A239592 * A239594 A239595 A239596

Keyword

nonn

Author

R. H. Hardin, Mar 22 2014

Status

approved