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A184122
Number of nX2 0..3 arrays with rows and columns in nondecreasing order.
1
10, 86, 561, 2861, 12068, 43947, 142376, 419213, 1139569, 2894178, 6931366, 15770131, 34291532, 71619470, 144269412, 281284873, 532422712, 980922994, 1763049635, 3097467201, 5328692624, 8990408705, 14896447100, 24269860485
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OFFSET
1,1
COMMENTS
Column 2 of
A184129
LINKS
R. H. Hardin,
Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n)=16*a(n-1)-120*a(n-2)+560*a(n-3)-1820*a(n-4)+4368*a(n-5)-8008*a(n-6)+11440*a(n-7)-12870*a(n-8)+11440*a(n-9)-8008*a(n-10)+4368*a(n-11)-1820*a(n-12)+560*a(n-13)-120*a(n-14)+16*a(n-15)-a(n-16) (=polynomial of degree 15)
EXAMPLE
Some solutions for 3X2
..0..1....2..2....0..1....0..2....0..1....2..3....0..3....0..2....1..2....1..2
..0..1....2..2....2..0....1..3....3..0....2..3....2..3....1..2....2..0....1..2
..3..3....2..3....2..2....2..2....3..1....3..1....2..3....2..1....2..3....3..0
CROSSREFS
Sequence in context:
A346923
A145146
A252981
*
A228123
A163412
A287827
Adjacent sequences:
A184119
A184120
A184121
*
A184123
A184124
A184125
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Jan 09 2011
STATUS
approved
