A194500 Number of lower triangles of an n X n 0..3 array with each element unequal to the sum mod 4 of its horizontal and vertical neighbors

3, 27, 776, 59052, 14348907, 10460353203, 22876792454961, 150094717239776832

Offset

1,1

Comments

Column 3 of A194505

Links

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

Example

Some solutions for 3X3
..0......1......1......1......2......1......3......2......2......1......1
..1.3....3.1....0.3....2.0....3.2....0.0....1.3....1.3....0.2....0.3....3.3
..1.1.3..2.0.2..1.2.3..3.0.2..1.1.3..2.3.0..1.1.2..2.0.1..2.3.1..3.2.3..0.3.1

Crossrefs

Sequence in context: A138525 A185149 A326086 * A012505 A331439 A085521

Adjacent sequences: A194497 A194498 A194499 * A194501 A194502 A194503

Keyword

nonn

Author

R. H. Hardin Aug 27 2011

Status

approved