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A067213 Number of n X n 0..5 matrices with all row and column sums equal. 2
1, 6, 36, 2442, 4756140, 255657603186, 394912380135575238, 18212451695911558370419098, 25800579898930843398657192741983084, 1146703506910134603350506378410721970397210150 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
EXAMPLE
Some solutions for n=3
..3..0..2....5..1..3....4..3..2....3..2..4....0..2..2....0..5..3....5..4..1
..2..0..3....1..4..4....0..4..5....5..4..0....0..2..2....3..3..2....2..3..5
..0..5..0....3..4..2....5..2..2....1..3..5....4..0..0....5..0..3....3..3..4
CROSSREFS
Column 5 of A202784.
Sequence in context: A197191 A208655 A202781 * A173604 A175719 A277726
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Feb 20 2002
EXTENSIONS
a(0)=1 prepended and a(6)-a(7) from Andrew Howroyd, May 11 2020
a(8)-a(9) from Sean A. Irvine, Dec 13 2023
STATUS
approved

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Last modified May 24 23:50 EDT 2024. Contains 372782 sequences. (Running on oeis4.)