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A278803 Number of nX4 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order. 1
15, 154, 1439, 12958, 110455, 870473, 6275546, 41370842, 250517485, 1402100369, 7299678838, 35565305995, 163045228099, 706720556002, 2908736101561, 11411036414661, 42812862296055, 154084456853488, 533397095123831 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A278807.

LINKS

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

R. H. Hardin, Empirical polynomial of degree 44

FORMULA

Empirical polynomial of degree 44 (see link above)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A278807.

Sequence in context: A010035 A334356 A017389 * A157380 A098685 A223995

Adjacent sequences:  A278800 A278801 A278802 * A278804 A278805 A278806

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 28 2016

STATUS

approved

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Last modified May 16 18:41 EDT 2022. Contains 353720 sequences. (Running on oeis4.)