A184690 1/3 the number of nX5 0..2 arrays with no element equal both to the element above and to the element to its left

81, 12288, 1841856, 275895264, 41325395328, 6189975781728, 927173138866560, 138877768818516672, 20801977386689522208, 3115849763962378244064, 466711388591033629230624, 69906939275393719770229056

Offset

1,1

Comments

Column 5 of A184694

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=171*a(n-1)-3370*a(n-2)+29805*a(n-3)-149108*a(n-4)+447784*a(n-5)-778496*a(n-6)+649216*a(n-7)-114688*a(n-8)

Example

Some solutions for 3X5 with a(1,1)=0
..0..1..2..1..0....0..0..0..1..0....0..0..0..2..1....0..1..1..1..0
..0..1..0..2..1....0..2..0..2..2....0..1..2..0..0....0..1..0..1..1
..0..1..1..0..2....0..2..1..0..2....0..2..0..2..0....0..1..0..0..2

Crossrefs

Sequence in context: A053913 A053895 A053905 * A143005 A187432 A017104

Adjacent sequences: A184687 A184688 A184689 * A184691 A184692 A184693

Keyword

nonn

Author

R. H. Hardin Jan 20 2011

Status

approved