A194609 Half the number of lower triangles of an (n+1)X(n+1) 0..2 array with no element equal to the average of its horizontal and vertical neighbors

5, 96, 4322, 571364, 205801866, 202803700252, 547917448108462, 4059864930297777162, 82468548660331834255159, 4592574521519240269995632810, 701184800636550713667143286769980

Offset

1,1

Comments

Column 2 of A194615

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

Some solutions for 3X3
..1......1......0......0......0......2......1......2......0......2......0
..0.2....2.2....1.2....1.0....2.0....0.1....0.2....1.0....1.0....0.2....2.2
..2.0.2..0.0.2..2.1.2..2.1.2..2.1.0..1.0.1..0.1.0..2.0.2..0.0.1..1.0.1..2.0.1

Crossrefs

Sequence in context: A285367 A208253 A284664 * A139950 A102734 A350516

Adjacent sequences: A194606 A194607 A194608 * A194610 A194611 A194612

Keyword

nonn

Author

R. H. Hardin Aug 30 2011

Status

approved