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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..7.

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

Adjacent sequences:  A067210 A067211 A067212 * A067214 A067215 A067216

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

STATUS

approved

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Last modified August 5 01:51 EDT 2021. Contains 346456 sequences. (Running on oeis4.)