A201350 Number of nX5 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor

4, 23, 118, 752, 4860, 29540, 164704, 838248, 3906802, 16781171, 66921332, 249553233, 875898271, 2910325591, 9200601794, 27796173121, 80558496898, 224724538799, 605174810816, 1577359861541, 3988423084299, 9803571070083

Offset

1,1

Comments

Column 5 of A201353

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) is a polynomial of degree 31 for n>10

Example

Some solutions for n=6
..0..0..1..1..1....0..0..1..1..1....0..0..0..0..1....0..0..0..1..1
..0..1..0..0..1....0..1..0..0..0....0..0..1..1..1....0..0..1..0..0
..0..1..0..1..0....0..1..1..1..1....0..1..1..1..1....0..0..1..0..1
..1..0..0..1..0....0..1..1..1..1....1..0..0..0..1....0..1..1..0..1
..1..1..0..0..0....1..0..0..1..1....1..0..0..1..1....1..0..0..0..0
..1..1..0..0..0....1..1..0..0..0....1..0..1..1..1....1..0..0..1..1

Crossrefs

Sequence in context: A174248 A353096 A297309 * A015532 A144465 A024050

Adjacent sequences: A201347 A201348 A201349 * A201351 A201352 A201353

Keyword

nonn

Author

R. H. Hardin Nov 30 2011

Status

approved