A238719 Number of n X n 0..2 arrays with no element equal to the sum modulo 3 of elements to its left or elements above it

2, 4, 40, 284, 11440, 296384, 43248968, 4105077596, 2157995166344, 751193181802392, 1429330959153482960, 1827061855695075169856

Offset

1,1

Comments

Diagonal of A238726

Links

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

Example

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

Crossrefs

Sequence in context: A098337 A326483 A187468 * A158213 A012596 A292700

Adjacent sequences: A238716 A238717 A238718 * A238720 A238721 A238722

Keyword

nonn

Author

R. H. Hardin, Mar 03 2014

Status

approved