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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
OFFSET
1,1
COMMENTS
Column 4 of A278807.
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: A370765 A334356 A017389 * A157380 A098685 A223995
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 28 2016
STATUS
approved