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A201980
Number of n X 7 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
0
4, 420, 301612, 729771318, 1706069013928, 2238761872232964, 1716349328902123738
OFFSET
1,1
COMMENTS
Column 7 of A201981.
EXAMPLE
Some solutions for n=2
..3..3..3..3..3..3..3....0..0..2..2..2..2..3....1..1..1..1..1..2..3
..3..3..3..3..3..3..3....2..2..1..1..1..1..0....2..2..2..2..2..1..0
CROSSREFS
Cf. A201981.
Sequence in context: A215647 A228242 A036771 * A080321 A360844 A264469
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 07 2011
STATUS
approved