A192844 Number of n X n symmetric 0..5 arrays with each element equal to at least two horizontal or vertical neighbors, containing at least one 5 and with new values 0..5 introduced in lower triangular row major order

0, 0, 0, 0, 0, 1, 110, 120266, 36138620, 24354992195, 18944127297891

Offset

1,7

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for 7X7
..0..0..0..1..1..3..3....0..0..1..1..1..4..4....0..0..1..1..4..4..4
..0..0..0..1..1..3..3....0..0..1..1..1..4..4....0..0..1..1..4..4..4
..0..0..0..1..1..4..4....1..1..2..2..2..2..2....1..1..2..2..2..2..2
..1..1..1..2..2..4..4....1..1..2..3..3..2..2....1..1..2..3..3..2..2
..1..1..1..2..2..4..4....1..1..2..3..3..2..2....4..4..2..3..3..5..5
..3..3..4..4..4..5..5....4..4..2..2..2..5..5....4..4..2..2..5..5..5
..3..3..4..4..4..5..5....4..4..2..2..2..5..5....4..4..2..2..5..5..5

Crossrefs

Sequence in context: A203718 A143750 A371032 * A234512 A343181 A028673

Adjacent sequences: A192841 A192842 A192843 * A192845 A192846 A192847

Keyword

nonn

Author

R. H. Hardin Jul 11 2011

Status

approved