A238805 Number of n X n 0..2 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, modulo 3

2, 8, 48, 468, 7502, 197418, 8526852, 605163204, 70386525080, 13408775102044, 4179101921059146, 2129605103994689632

Offset

1,1

Comments

Diagonal of A238812

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=5
..2..2..0..0..0....0..2..2..0..0....0..0..0..2..2....2..2..0..0..0
..2..2..0..0..0....2..2..1..2..0....2..2..0..1..2....2..1..0..2..2
..0..0..0..2..2....2..1..2..2..0....2..1..0..0..0....0..2..2..1..2
..0..0..0..2..2....0..2..2..0..0....0..0..0..2..1....0..2..1..0..0
..0..0..2..1..0....0..0..0..0..2....0..0..0..2..1....0..0..0..0..0

Crossrefs

Sequence in context: A327904 A006925 A185135 * A005867 A377469 A280133

Adjacent sequences: A238802 A238803 A238804 * A238806 A238807 A238808

Keyword

nonn

Author

R. H. Hardin, Mar 05 2014

Status

approved