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A201351 Number of nX6 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor 1
5, 36, 273, 2732, 29540, 310036, 3030673, 27104947, 220732437, 1641106829, 11206232481, 70771398891, 416197943012, 2293568841898, 11910310629163, 58569696365494, 273928804681607, 1223107208560736, 5231237485621038 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A201353

LINKS

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

FORMULA

Empirical: a(n) is a polynomial of degree 63 for n>22

EXAMPLE

Some solutions for n=5

..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..1..1....0..0..0..0..1..1

..0..0..0..0..0..1....0..0..0..0..1..1....0..0..0..1..0..0....0..1..1..1..0..1

..0..0..0..1..1..1....0..0..0..1..0..0....0..0..0..1..1..1....1..0..0..0..0..1

..0..1..1..0..1..0....0..0..1..1..0..1....0..1..1..0..0..0....1..0..1..1..1..0

..1..1..1..0..0..0....1..1..1..1..0..1....1..1..1..1..0..0....1..1..1..1..0..0

CROSSREFS

Sequence in context: A164110 A285392 A327091 * A253470 A188899 A052203

Adjacent sequences:  A201348 A201349 A201350 * A201352 A201353 A201354

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 30 2011

STATUS

approved

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Last modified January 20 14:17 EST 2021. Contains 340302 sequences. (Running on oeis4.)