A194503 Number of lower triangles of an n X n 0..6 array with each element unequal to the sum mod 7 of its horizontal and vertical neighbors

6, 216, 46872, 60466140, 470184984576, 21936950640377856

Offset

1,1

Comments

Column 6 of A194505

Links

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

Example

Some solutions for 3X3
..1......3......6......0......1......2......5......0......4......2......4
..2.2....4.6....3.2....5.6....0.3....5.2....4.1....6.2....5.5....0.1....1.3
..5.2.3..6.0.5..4.0.6..3.3.6..0.5.3..3.2.1..0.2.6..1.6.5..6.6.1..5.2.0..4.1.6

Crossrefs

Sequence in context: A281431 A109354 A193613 * A229869 A234610 A041623

Adjacent sequences: A194500 A194501 A194502 * A194504 A194505 A194506

Keyword

nonn

Author

R. H. Hardin Aug 27 2011

Status

approved