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A201535 Number of nX4 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor 1
6, 69, 633, 7799, 91425, 983981, 9526987, 82847704, 652848538, 4712696751, 31480011434, 196280028176, 1150650039753, 6380377582098, 33631853768986, 169225758487160, 815686475352515, 3777731764480697, 16854911299206527 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A201539

LINKS

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

FORMULA

Empirical: a(n) is a polynomial of degree 80 for n>43

EXAMPLE

Some solutions for n=5

..0..0..0..1....0..0..0..1....0..0..2..2....0..0..1..2....0..0..2..2

..0..0..2..1....0..0..0..1....0..2..2..2....1..1..1..2....0..1..0..0

..0..1..2..2....0..1..2..2....1..1..1..2....1..2..0..0....0..1..1..1

..1..1..1..0....2..1..2..0....1..2..0..0....2..2..2..2....2..0..0..2

..2..2..0..0....2..1..2..0....1..2..0..0....2..2..2..2....2..0..2..2

CROSSREFS

Sequence in context: A183438 A296016 A288719 * A198699 A258792 A214694

Adjacent sequences:  A201532 A201533 A201534 * A201536 A201537 A201538

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 02 2011

STATUS

approved

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Last modified April 5 16:53 EDT 2020. Contains 333245 sequences. (Running on oeis4.)