A194611 Half the number of lower triangles of an (n+1)X(n+1) 0..4 array with no element equal to the average of its horizontal and vertical neighbors

36, 3638, 1674043, 3703163910, 38969955227338, 1946585305112431165, 461761593540314858209528, 520265339158575595235640177020

Offset

1,1

Comments

Column 4 of A194615

Links

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

Example

Some solutions for 3X3
..3......2......2......0......1......4......4......3......1......3......1
..0.4....0.3....4.2....3.1....2.2....0.1....1.1....4.0....2.3....1.0....4.4
..1.3.1..4.0.3..4.2.1..4.1.4..2.3.1..0.3.0..4.2.3..3.1.4..0.1.2..1.3.2..2.3.0

Crossrefs

Sequence in context: A209267 A120349 A120359 * A165984 A297021 A304459

Adjacent sequences: A194608 A194609 A194610 * A194612 A194613 A194614

Keyword

nonn

Author

R. H. Hardin Aug 30 2011

Status

approved