A194501 Number of lower triangles of an n X n 0..4 array with each element unequal to the sum mod 5 of its horizontal and vertical neighbors

4, 64, 4160, 1048560, 1073741824, 4398046511104, 72057594037927936

Offset

1,1

Comments

Column 4 of A194505

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for 3X3
..0......1......3......1......0......1......2......2......4......1......0
..2.0....0.3....2.4....0.2....1.0....4.0....4.2....0.4....2.3....2.2....3.4
..4.1.4..2.4.0..1.1.4..1.4.2..0.3.1..0.0.2..3.1.2..2.0.1..3.4.0..3.3.4..3.2.4

Crossrefs

Sequence in context: A053763 A193611 A193755 * A348315 A053923 A359231

Adjacent sequences: A194498 A194499 A194500 * A194502 A194503 A194504

Keyword

nonn

Author

R. H. Hardin Aug 27 2011

Status

approved