A194504 Number of lower triangles of an n X n 0..7 array with each element unequal to the sum mod 8 of its horizontal and vertical neighbors

7, 343, 118096, 282475256, 4747561509943, 558545864083284007

Offset

1,1

Comments

Column 7 of A194505

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 3X3
..2......3......7......0......6......0......3......6......5......4......7
..7.1....4.2....4.2....6.4....4.4....2.4....5.2....4.4....1.0....2.3....4.4
..6.4.1..4.3.1..2.3.6..1.7.4..5.2.5..4.3.0..6.3.7..0.7.4..0.2.1..7.6.0..0.6.0

Crossrefs

Sequence in context: A013712 A109493 A193614 * A347505 A015479 A268309

Adjacent sequences: A194501 A194502 A194503 * A194505 A194506 A194507

Keyword

nonn

Author

R. H. Hardin Aug 27 2011

Status

approved