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URL: https://oeis.org/A229416

⇱ A229416 - OEIS

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A229416
Number of n X n 0..3 zero-diagonal arrays with corresponding row and column sums equal.
1
1, 4, 136, 59008, 345706336, 28256240134144, 33097994593655140864
OFFSET
1,2
COMMENTS
Column 3 of A229417
EXAMPLE
Some solutions for n=4
..0..2..3..3....0..0..0..1....0..1..2..0....0..3..2..0....0..3..0..1
..3..0..3..0....0..0..0..1....0..0..3..3....2..0..2..3....1..0..2..2
..2..3..0..3....0..0..0..3....3..2..0..3....0..2..0..3....3..0..0..1
..3..1..2..0....1..1..3..0....0..3..3..0....3..2..1..0....0..2..2..0
CROSSREFS
Sequence in context: A012070 A366446 A001374 * A155207 A201388 A089666
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 22 2013
STATUS
approved