A194499 Number of lower triangles of an n X n 0..2 array with each element unequal to the sum mod 3 of its horizontal and vertical neighbors

2, 8, 72, 1020, 32768, 2097152, 268460064, 68721573888, 35184372088832, 36028797020012544

Offset

1,1

Comments

Column 2 of A194505

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for 3X3
..1......1......2......0......0......0......0......2......0......1......1
..0.0....2.0....0.0....2.0....2.1....2.2....2.2....1.2....2.0....0.2....2.1
..1.2.0..2.2.1..0.1.2..0.2.0..2.1.0..1.1.0..1.1.2..1.2.0..0.2.1..2.1.2..1.1.0

Crossrefs

Sequence in context: A060635 A377401 A364408 * A009478 A038057 A107270

Adjacent sequences: A194496 A194497 A194498 * A194500 A194501 A194502

Keyword

nonn

Author

R. H. Hardin Aug 27 2011

Status

approved