A240040 Number of n X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or zero 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, 4, 26, 346, 7514, 640643, 104619164, 49892724623

Offset

1,1

Comments

Diagonal of A240046

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A032076 A182146 A218077 * A088888 A102996 A358563

Adjacent sequences: A240037 A240038 A240039 * A240041 A240042 A240043

Keyword

nonn

Author

R. H. Hardin, Mar 31 2014

Status

approved