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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
1
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
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 * A377110 A015532 A144465
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 30 2011
STATUS
approved